Questions tagged [pex]

PEX (cross-linked polyethylene) is a flexible plastic pipe that has gained popularity due it being cheaper (and often easier) than copper or PVC. Use for questions about working with the pipe, and use with the [plumbing] tag

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1answer
69 views

For a bathroom pex plumbing should I go with trunk-branch or with a home run manifold plumbing layout?

Below is the layout of my bathroom and my starting point are the red/blue vertical copper pipes you see in the picture. The walls you see will be tiled so not sure how much sense would make to have a ...
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2answers
106 views

Basement bathroom PEX branching to fixtures

We're plumbing our new basement bathroom. The nearest fixture from the main hot/cold water line will be the vanity sink. Can I run from the main line to the vanity sink (one faucet), and then branch ...
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74 views

Does anyone recognized this PEX Crimp System (Make/Model)?

Does anyone recognized this product? Looks like a good idea. There is this red spacer ring to help position and hold the crimp ring in the right place. I want to know more about it.
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1answer
75 views

How to protect PEX pipes from puncture

I'm replacing the copper pipes in my house and I'm converting the trunk and branch type to home run style using PEX A pipes. I want to protect the pipes in the wall that I'm running them up from the ...
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2answers
45 views

Water flow with plastic and brass pex fittings

Is the smaller ID on plastic fittings (for pex) "smaller enough" than brass to have an effect on water flow through the pipes? I'm trying to do everything I can to get the most possible ...
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43 views

Can red dye cause premature failure in pex tubing?

I've been told that red pex had a higher failure rate because of some flaw introduced by the red dye in it. Has anyone heard anything like that? I can't find anything online about it so far.
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40 views

PEX - Do not install tubing above or below septic tanks, leach fields, pits, or cesspools - why?

I am reading the "Installation Manual for Viega PureFlow Water System" and on page 41 it states: Do not install Viega PureFlow PEX tubing where soil is or may become contaminated with ...
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32 views

heating system backwards?

I have an outdoor wood boiler about 40' from my house. It is piped to a heat exchanger on the water tank, and then to the oil furnace(doesn't burn oil). I think the supply and return have been ...
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1answer
147 views

Burying PEX Pipe in the ground

Revised: September 27, 2020 @ 4:30 PM. Background Information This is an existing installation by a national builder. I had to dig up this section for another reason and found a PEX splice. I wanted ...
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54 views

Water feed pipe diameter: is 1/2" OK?

The 3/4" water feed in a slab has a leak. A proposed bypass includes a 1/2 inch PEX, run through the ceiling. Why should a 1/2 inch PEX be used to bypass and not a 3/4 inch? Assume that the ...
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1answer
23 views

Threaded Brass adapter leak

A pair of adapters is bridging CPVC to PEX. The pair is coupled through threaded brass: PTFE Teflon tape was applied. There is a very slight leak in the brass threading. Any suggestions remedy the ...
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1answer
64 views

PEX Outdoor UV Protection

PEX must be protected from UV A Florida bypass will require 20 feet of pipe be outdoors: it is in a rectangular tunnel, where it is mounted to concrete overhead, but sunlight illuminates the ...
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14 views

PEX / CPVC leak-test

The leak check includes a visual self-inspection of each end of a pressurized new PEX pipe. The PEX is to be piped into existing CPVC: the plan is to leak-check every 12 hours. How many days should ...
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1answer
49 views

PEX minimum radius of curvature

The photographed PEX radius of curvature is approximately 2 feet. What is a reasonable curvature for PEX piping? What is the minimum RoC? I ask because if I can avoid using a 90 degree shark bite, ...
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1answer
105 views

Can you use PEX for venting?

Is there such an option as using PEX for an 1-1/2 vent ? I have a stretch where I need some flexibility for my pipe which is going to be difficult to achieve with copper or ABS. this is related to ...
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24 views

What is the minimum thickness of concrete above hydronic heating pex

I am doing a diy hydronic heating system in a house I bought in the mountains. For the main part of the house I am using 3/4" x 9" strips of plywood with spacing for the tracks of the 1/2&...
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1answer
41 views

Temporarily cap PEX pipe while laying new flooring?

I am remodeling a bathroom. We’re going to lay new tile and replace a vanity. This requires removing the toilet and old vanity. In order to remove the old vanity I need to cut the PEX piping attached ...
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63 views

Adding a second shower head from 1/2" PEX

I want to add a second shower head in our shower. Ideally both heads would be controlled by their own temperature and pressure valves. I do not want to run any new lines from the manifold however. We ...
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1answer
61 views

Plumbing re-routed through attic

We recently had a leak under our slab foundation and ended up going with rerouting the plumbing through our attic. After it was done, we have noticed that there is now a distinct odor (of the PEX ...
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1answer
149 views

Can I run PEX water lines/PVC drain pipe in “warm” side of insulated exterior wall?

I want to re-plumb the PEX water lines + drain supply line in my laundry room. The back wall of the laundry is an exterior wall with standard fiberglass insulation. Currently, the water lines to the ...
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3answers
242 views

Outside garden hose bib plumbing - 1/2“ or 3/4”'pex

I recently renovated and I now want to setup an outside garden hose. I can either hook it up to the 1/2" PEX or the 3/4" PEX. I have 3/4" PEX coming from main water entry to my water ...
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1answer
41 views

Uneven copper bellow threading when replacing copper pipes with PEX

I had a water leak behind my shower and found that it was leaking through the soldering of a copper pipe. There's a threaded male connected and the copper pipe was going inside of it and sealed with ...
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1answer
48 views

What's the difference (if any) between these two types of PEX-to-copper fittings?

There are two kinds of similar fittings to transition from copper pipe to PEX tubing. Here's an example: The first is made from copper and looks to be "formed" ie bent / pressed into shape in a mold. ...
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162 views

How close can pex tubing be to a boiler?

I am adding radiators to my 2-pipe central heating (UK). The whole piping is copper 22mm and microbore, and I'm extending it with 15mm pex barrier pipe graded for central heating. I know that the ...
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57 views

attaching a coupling to copper pipe very close to wood

I have a copper pipe connected to a pex pipe by a leaking sharkbite fitting. I'd like to replace the sharkbite fitting with something more permanent. However I'm not sure if it's safe to use a ...
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1answer
264 views

Electrical Bonding of Service Panel After PEX Replacement of Galvanized Pipes

My house was built in 1929 and has gone through many rounds of plumbing/electrical upgrades over the years. I am replacing the galvanized pipes with PEX and I'm confident that I have planned ...
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51 views

How do you finish a valve when using pex pipes

I'm doing all of my work with expansion PEX. I'm a little puzzled about how to finish the valves where the toilets and sinks connect. Are you supposed to just leave the plastic visible where the valve ...
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1answer
55 views

Replacing polybutylene pipe to add a new outdoor spigot (freeze proof sillcock)

I need to replace the entire outdoor spigot (sillcock), the shutoff valve that goes with it (because it is old and leaking), and some polybutylene pipe in the process. I have included several photos ...
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45 views

Attaching 1/2" PEX swivel elbows to shower valve body

I have a shower valve body that has two outputs to main shower head/sprayer and also an overhead rain shower head. The problem is that the outputs are 1/2" MIP and they are close together...too close ...
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4answers
169 views

Threading cable through existing pex-like tubing

My apartment (top floor) has runs of 3/4" (-ish) pex-like tubing (photo attached, Switzerland if it's relevant) running from a central point. One such tube carries an existing coaxial cable (landlord ...
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1answer
69 views

Well Pump Setup: Best Materials to Use for Pipes

I live in Southwest Florida, and we have well water. I am in the process of redoing our whole well input plumbing setup and wondering about the best materials to use. This is what I'm proposing as a ...
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32 views

Water flow/pressure drop

When I was installing a tankless water heater in a new location - I decided to replace my 1/2 copper with 3/4 pex as part of the project. However, after turning on the water back on if more than one ...
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1answer
726 views

Can the drain pipes in my kitchen soffit be relocated into the wall?

I'm in planning stages for a major kitchen remodel. Home built in 1984 with PEX plumbing, all electric, etc. We would like to demo the kitchen soffit (bulkhead) to make the ceiling level and install ...
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2answers
363 views

PEX pipe burst: what else needs to be fixed to prevent it happening again?

I'm a renter in NYC and our 4-story building has recently-installed (within the last 8 years) baseboard hydronic heat. All of the tubing is PEX, except for from the boiler itself (as required by code) ...
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3answers
898 views

Can I replace hydronic water boiler return pipes with pex?

My house was built in the 1920s, the heating source was a hot water/radiator system. Originally the basement was probably used only for a coal furnace (we have the drop-off door that the coal guy used ...
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48 views

PVC ring Shut off valve? [duplicate]

I just bought a house built in 1984 it has PEX plumbing. I need to remove a toilet to install a new floor and I noticed the water supply line to the toilet connects to a water shut off valve that I’ve ...
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1answer
212 views

PEX Line Toilet Water Supply Disconnect

I just bought a house built in 1984 it has PEX plumbing. I need to remove a toilet to install a new floor and I noticed the water supply line to the toilet connects to a water shut off valve that I’ve ...
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2answers
157 views

Installing Smart Water Monitor/Valve

We recently moved into a new home and have been blessed with sloppy plumbing and high water pressure. The whole home is copper and since moving we have had 3 leaks in various joints. I'm no expert but ...
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3answers
127 views

Inaccessible outdoor PEX piping lost its insulation - what to do?

We have an outdoor counter and sink, and a family of squirrels decided that it was a good place to live. Unfortunately they ripped off a good portion of the PEX piping insulation. (Pretty sure it's ...
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1answer
184 views

Is it a problem to have PEX manifold outlets adapted from 1/2 to 3/4?

A contractor has installed my 3/4 inlet, 1/2 outlet manifold using 3/4 tubing on the outlets. He used a few inches of 1/2 pex to connect the outlet tubes to the manifold. This seems odd, but I’m not ...
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1answer
2k views

Installing PEX pipes close to heating vents

We are renovating all the bathrooms in our house that was built in the early 70s. The plumber has replaced most of the copper pipes with PEX tubing. He has not replaced copper entirely and has ...
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1answer
47 views

PEX repipe and hot water issues

We just repiped out 45 yrs old house with PEX and the whole process was very smooth and I’m glad we did this. I knew the water pressure would change going from 90 psi water pressure to I don’t know ...
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405 views

Any differences between Apollo PEX-B and Sharkbite PEX-B - Need to Run through Wooden Studs

I noticed that near me, HD carries Apollo PEX-B and Lowe's sells Sharkbite PEX-B. Are there any differences between these two in terms of flexibility, durability, etc? I wasn't sure if one brand was ...
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2answers
382 views

Would Replacing an Existing 3/4“ Water Main Line with 1” Improve Overall Volume/Flow to House (GPM)

After my own inspection and talking to the utility company I have the following: The meter (near the road) is 5/8" x 3/4". From what the water company told me - this is the most commonly installed ...
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1answer
1k views

Installing Spigot Upside Down and Close to Ground

I live in a trailer and am debating attempting to put a hose outside/on the side. A few considerations: I have no plumbing experience It gets -40 where I live in the Winter I have read great things ...
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2answers
680 views

How crooked can you crimp pex rings?

I had to add a supply valve for my refrigerator in my house. It's my first time working with pex. I added some Pex B to my existing Viega cold water line and used copper crimp rings with the ...
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2answers
325 views

Is PEX very susceptible to damage from rats/rodents?

A friend of mine wants to re-plumb his house. The neighborhood has recurring issues with rats. I heard rats like to (as in "seek out opportunities to") chew through and damage PEX plumbing, whether ...
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1answer
1k views

What should happen with plumbing ground connections when converting to Pex?

My house is being re-piped by replacing all of the copper with PEX starting at the water service entrance. I'm on a well which is 150' from the house and the service line is CPVC. Currently, there is ...
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70 views

Tapping into existing 3/4“ supply and 3” drain to add washer

I understand there are a lot of variables to something like this, so I'm going to try to provide enough detail that people can at least understand the question here: I have a washer/dryer I'd like to ...
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2answers
2k views

3/4“ PEX fittings less than 3/4”?

I have some plumbing that has been done in 3/4" PEX and the 90-degree brass elbow fittings that connect the lengths of tubing fit inside the tubing, so I don't see how these elbow fittings could ...