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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30 views

Replace Copper Pipe & Gate Valves With PEX Pipe & SharkBite Ball Valves & Fittings

Summarize the problem My 35 year-old home's water supply gate valves and outdoor hose bibbs are very difficult to turn on and off. Provide details and any research The primary water supply comes in ...
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4answers
101 views

Hose splitter leading to low pressure

I recently added a garden hose splitter to my bib in my garage and outside, to be able to use 2 hoses at the same time from the same bib. I would sometimes need to run both my garage bib and outside ...
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83 views

Can I safely attach new fittings to an older PEX A line?

I have a 10yr old "PEX A" line (red, 1/2", "potable," "100PSI") running to my rear hose bib. I'd like to install a tee in this existing line and run a branch to the ...
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177 views

Can pex be used underground?

I have 2" PVC coming from my well, connecting to a PVC shutoff valve and then to an existing spigot. I want to removed existing spigot and extend water line 140ft to my RV location and install a ...
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1k views

Is putting a pex tube underground and then through a concrete slab OK?

I have a house with a basement and I'm building a garage about 50 feet away in the backyard. The garage will be on a concrete foundation and I want to run both power and water out there. (I want the ...
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1answer
55 views

Can you use wirsbo/uponor/expansion pex for underground sprinklers?

I cant find much information around this online, it appears that its possible.
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1answer
144 views

Is it normal for installed PEX piping to be curved or bowed?

Red PEX is curling or bowing throughout the main hot water line from hot water tank feeding all the faucets and showers. Is this normal?
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2answers
127 views

Protecting PEX/UF-B/Ethernet from gophers with hardware cloth?

I have a well house and some outbuildings that will need some water. I am running 1" PEX underground in 30" deep trenches to these buildings, as well as 10/3 UF-B and some ethernet cable for ...
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3answers
231 views

When using using 3/4 PEX for cold water in a bathroom that has shower, sink and toilet, do I need to reduce to 1/2 when I am branching to the fixture?

I was advised to use 1/2 PEX for the hot water and 3/4 Pex for the cold water The bathroom has shower, sink and toilet Do I need to reduce to 1/2 when I am branching to the fixture ? I can't find ball ...
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110 views

Running PEX exposed along garage ceiling for spigot

I was planning on running PEX-A from my basement, through my garage to the exterior cement brick wall (20-30 ft) and down where I'd like to put a small spigot (maybe will a small run of copper along ...
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1answer
157 views

Do I need a floor drain for the water heater in my townhome?

I’m looking at replacing an 11-year-old water heater as the hot water has become extremely discolored recently. I have flushed it twice in five years (I know, not enough) and could never remove the ...
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2answers
28 views

T tap with valve for pex?

This picture is of a 1/4 inch PEX line from a reverse osmosis filter. This section is right before a remineralization cartridge. The water before that cartridge is fairly close to being distilled ...
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1answer
83 views

Can PEX be installed in sections?

I have an older house with lots of pinhole leaks in the copper pipes. From what I have been told, you have to replace the pipes, copper or PEX or maybe something else. I am trying to avoid the ~$10k ...
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2answers
39 views

Brass push-fitting pipe insertion depth (standard or varies by brand?)

I have a 90-degree "elbow" 1/2 (both sides) brass push-fitting installed by previous owner. I'm replacing the PEX pipe. I don't know the brand of the fitting but it is NOT SharkBite. Do all ...
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1answer
203 views

Frozen PEX in exterior shower wall

The temp dropped to zero last night and the shower head mounted on an exterior wall has no water flow: frozen PEX line. There is no access to this space from above or below. If I use a hair dryer on ...
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4answers
263 views

Pipes on Exterior Wall

I recently had frozen pipes in my basement. I took some drywall down to identify the location of the frozen pipes and to apply heat to thaw it. It appears the frozen section is somewhere about halfway ...
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2answers
225 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
243 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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1answer
119 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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2answers
550 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
406 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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84 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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47 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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33 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
2k 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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1answer
59 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
30 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
420 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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16 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
182 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
200 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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33 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
115 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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124 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
176 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
497 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
3k 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
86 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
53 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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279 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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1answer
145 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
914 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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2answers
79 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
171 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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4answers
402 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
610 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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51 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
2k 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
1k 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
2k 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 ...