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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23 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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18 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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62 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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69 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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105 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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67 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
88 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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98 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
88 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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285 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
35 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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79 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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130 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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31 views

where to run pex in cabin

pressure tank in unheated cabin Best way to keep a PEX run in an attic (above a foyer) from freezing? I have the full well and pressure tank system finally working :) Need a run from the wiring ...
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1answer
244 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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303 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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123 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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22 views

1/2 pinch clamp for 3/4 PEX?

I used a 1/2 pinch clamp on a 3/4 PEX and it worked. I was in a pinch, no pun intended! Should I change it out? It's been a few weeks now, no leaks. Tom
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239 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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46 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
319 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 ...
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2answers
136 views

PEX: Is it worth replacing crimps with push connections?

I happened upon a question about PEX tubing last week here and in it there was some discussion about how push connections are superior. (If someone can point me to that question, I'd appreciate it.) ...
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192 views

What is the recommended method of insulating PEX piping?

During the winter chill here in DC, one of my pex pipes that is not insulated and basically exposed to the elements cracked. I blame the contractors who didn't insulate and finish the job, literally ...
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255 views

Connecting new Pex water line to 20 yr old Pex

I'm preparing to connect new 1” Pex water line from well to 20 yr old house, that is also Pex piping. I plan to either use copper crimp rings or shark bite clamp fittings. My question is, could there ...
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821 views

Does 3/4” pex supply enough water for a house

Will 3/4” pex with an inside diameter of .68 inches have enough capacity to supply a 3/4” manifold with 1/2” supply lines to a bathtub, washer and toilet and sink with no pressure drop? I plan on ...
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793 views

Can you re-crimp the end of a PEX tube?

If you take apart an existing PEX connection, is it going to perform correctly if you re-crimp the same end of the tube - without cutting it - to a new fitting? Often with PEX you can flex it a bit ...
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65 views

Should I replace 3/4“ and 1/2” galvanized pipe with the same sizes of pex?

So I am about to replumb my house. From the meter to my house is 3/4" 60 yr old galvanized pipe. Once it gets to the house it changed to 1/2" lines serving everything in the house. Example is a 1/2" ...
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4answers
2k views

Would increasing pipe size just after the meter give better flow without increasing pressure too much?

I have a wife and 5 kids. Three of them are teenage girls, which means I hardly ever get a chance to shower. I wanted to put in a second bathroom to help fix this. I spoke with some local plumbers and ...
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2answers
125 views

Pex bend supports keep breaking

I've used PEX bend supports in the ½" size before which worked great, but trying to use them for ¾" has been difficult. Regardless of the method I've tried, the plastic ones keep snapping. Using the ...
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25 views

Estimating plex tubing purchase

I am in the planning stages of building a new 4300 sqft home for my family. I am working to build out how much it will cost to run all the supply lines for my plumbing (contracting out the drains). ...
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2answers
523 views

Do pex fittings need to be replaced when installing a new water heater?

I have purchased a new water heater to replace the original 11 year unit. I am concerned in attaching the existing fittings to the new unit. I believe the builder used pex directly to the original ...
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1answer
217 views

Can anyone identify/name this plumbing component?

Located under all the "AM/PM Kitchen" (bedroom) sinks in the house: It adapts the 3/8 PEX output from the mixer valve to 1/4 PEX to the spigot. The thing that looks like a valve does not appear to do ...
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292 views

What's up with the PEX on this shower valve?

I've been using PEX for a couple years now. I came across a few shower valves recently, but the 1/2 PEX lines for the hot/cold are not what I'm used to seeing. Please compare my photo (top) with a ...
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683 views

Sleeve for below grade pipe penetration

I need to run a hot and cold water supply line to an outside structure 13' away through my basement block wall. This is in the Northeast US, where the frost line is 42" and the penetration will ...
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2answers
116 views

Copper to PEX connection

I am swapping out an old pedestal sink for a conventional vanity. Currently in place are some 1/4 pex lines that are run through the pedestal. I want to swap the small pex for 1/2” and am fairly ...
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40 views

Concealing PEX indoors with a metal hat channel

I'm replacing the galvanized incoming cold line with PEX. The incoming line runs into the exterior wall of the home about a foot from the ground, then goes down the wall, through the sill plate into ...
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4answers
4k views

Is copper piping required within a certain distance from a water heater?

I have read that National Code requires you to use copper for 18 inches from your water heater. How can I do this when everything existing is PEX? I need to replace my existing low boy water heater ...
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79 views

Can negative pressure in a PEX plumbing system cause or contribute to leaks?

Generally, when draining one's plumbing system all the faucets (or at least the ones at the ends of the manifolds or loop) should be opened so that all the water drains from the system and as the ...
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1answer
259 views

PEX Home Run System

I am looking for insight. I am the 3rd owner of a single-story home built in the late 80s. It has 3/4" polybutylene (PB) plumbing running through the attic with 1/2" PB branching off. We have 2 full ...
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737 views

Do I expand or crimp pex water line, and why?

New construction water lines, should I use expansion on the fittings or should I crimp them?? And why- pros and cons of each. I have another question posted about proper sewer venting diagrams and ...
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1k views

Using PEX as wire conduit

I have some 1/2" PEX-AL-PEX left over and thinking about using it as conduit for ~20' ethernet or phone cable. Pipe is appropriately orange. Will the aluminium layer provide RF shielding? (assuming I ...
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1answer
301 views

Do I need a regular Tee or a Slip Tee to add new line (pex) to existing line (copper)?

I'd like to cut into an existing hot water (copper) line to add a Tee and run a new hot water line to somewhere else in the house. Do I need a regular Tee or a Slip Tee? I'll be using Sharkbite ...
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3answers
1k views

Chemical Smell After Tankless Water Heater Install

I recently had a plumbing company install a tankless water heater in my crawlspace. Everything with the install works and looks great, but we are experiencing a very strong chemical smell (like nail-...
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1answer
126 views

What size manifold for 1" pipe from meter?

I am running all new water supply in an old house (c 1884). The incoming line from the meter is 1" galvanized (no idea how much mineral buildup is inside). Will it be sufficient to replace all of ...
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2k views

Should I replace my trunk-and-branch setup with a PEX manifold?

My house is plumbed using PEX trunk-and-branch, with the main 3/4 line coming in, splitting off to 3/4" to the hot water tank, and then a 1/2" trunk that all the other branch supplies tee off from. ...
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3k views

What is the correct material to sheath pex pipe under a slab?

It's recommended in my area (due to rocky soil) to install a sheath or channel under the slab for the pour, then slide the PEX into the sheathes afterwards during the rough. This also allows the PEX ...
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152 views

What brand are these pex threaded T connectors?

Has anyone ever seen these type of PEX connections? I can't find them anywhere online or otherwise.
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4k views

Can polyalloy (plastic) pex fittings be used with both styles of attachment rings?

Some pex fittings are made of a type of durable plastic known as polyalloy. Examples: These fittings appear to be plastic equivalents of their brass counterparts. In general is it permissible to ...
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58 views

How do water piping sizes compare?

Comparing different types of water piping is confusing. It seems that a 1/2" copper pipe is not the same size as a 1/2" PEX tube. I've read different things in different places (e.g. forums). Which ...