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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61 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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28 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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85 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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99 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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40 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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16 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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1answer
75 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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41 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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86 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
91 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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Sink Faucet takes a long time to get warm

New Construction Tankless water heater (1 gpm activation) PEX Tubing (the red and blue) Kitchen faucet is Moen 5923 - supposed to be 1.5gpm If I turn on another sink in addition to the kitchen sink, ...
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1answer
124 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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135 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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310 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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201 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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1answer
44 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
693 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
86 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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24 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
216 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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119 views

How to calculate pressure loss on PEX 90-degree elbows?

I'm probably overthinking this, but I need to, as close as possible, determine how much pressure I'll lose with PEX 90 degree elbows. Had a new well pump installed (1 hp, 10 GPM), well guy is wrapping ...
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1answer
205 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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220 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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392 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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88 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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26 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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3answers
2k 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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47 views

What is the outer diameter of 1/2" expansion pex ring when fitted?

Expansion pex-a fitting F1960 / uponor / wirsbo stretch over fittings and use a secondary ring on top of the pex tube to hold the fitting. What is the outer diameter of the full ensemble, including ...
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65 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
172 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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1answer
553 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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4answers
922 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
136 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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545 views

Chemical Smell After Tankless HWH Install

I recently had a plumbing company install a tankless hot water heater in my crawlspace. Everything with the install works and looks great, but we are experiencing a very strong chemical smell (like ...
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1answer
90 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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1answer
1k 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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2answers
2k 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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2answers
137 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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1answer
3k 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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1answer
55 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 ...
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1answer
681 views

Pex Connections As Unions?

I've noticed that in a properly (I assume) crimped Pex connection the tubing will rotate around the fitting it is crimped to - so that you have, in effect, a union. So, I'm wondering: Is that how it ...
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118 views

What Pex system and re-design would you use for this small bungalow update - Floor Plans Attached?

There is a small Bungalow in the Midwest that I have attached two new design drawings for. Its a smaller 740sqft home with a 1st floor and current unfinished basement. I wanted to see if the group ...
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1answer
89 views

Can I use pex for this connection between the shower and the tub faucet?

Can I use pex from my shower valve to my tub drop ear elbow?
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1answer
126 views

What type of plastic water supply pipe do I have in my crawlspace?

The hot water line under my crawl space cracked so I am trying to replace myself. The existing pipe is grey, has CTS 3/4" 7/8 O.D. print and connected with brass ring clamps and fittings. So I ...
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1answer
2k views

Ground Wire (or Wires) after PEX Installation

I recently had my galvanized pipes professionally replaced and now think I have an issue. Previously, The ground wire that ran from my electrical panel used the galvanized pipe as the "conduit" to ...
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3answers
1k views

Installing a dedicated hot water recirc line and pump

I'm going to re-plumb my house. It's a 3 bed, 2 bath house. All the plumbing is on the main level, and the basement is partially finished. I'm renovating down in the basement and decided while I was ...
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298 views

Are there ball-check valves available for pex? [closed]

After some searching the web I am failing to find any available ball-check valves (described on: https://www.archtoolbox.com/materials-systems/plumbing/plumbingvalvetypes.html) that I can use with my ...
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190 views

Can Zurn oxygen barrier pex radiant heating pipe be used for potable water?

Is it safe to use some oxygen barrier Zurn hydronic heating pipe for potable water?
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1answer
717 views

Water Softener Drain Line with Loop - Flexible PVC to Sharkbite?

So, I bought a Genesis Revolution upflow water softener to install in my first house in Laveen AZ. We have a water softener loop already plumbed into the house. The airgap is in the laundry room ...
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1answer
536 views

Is PEX water piping allowed in San Francisco?

I’m sorry if this is inappropriate to ask so specifically for San Francisco dwellers, but I couldn’t find the answer this online. Does anyone know if PEX plumbing is allowed for water piping ...