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Plumbing - PEX pipe elbow or brass fitting seems very narrow

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  • Jan 22nd, 2018 6:42 pm
[OP]
Member
Nov 17, 2016
288 posts
177 upvotes

Plumbing - PEX pipe elbow or brass fitting seems very narrow

I have a contractors working on my bathroom renovations. They are using 1/2'' PEX tubes for plumbing and I noticed that standard 1/2'' elbows (example: https://www.homedepot.ca/en/home/p.12-b ... 45037.html) and brass fittings (example: https://www.homedepot.ca/en/home/p.12-i ... 57394.html) goes INSIDE of the tube and because brass is thick, it substantially narrows diamater that watter can pass through and I am just assuming that this should impact on how much water can flow through these tubes. I am afraid that my raindrop showerhead (12'') and hand shower head will not have enough preassure. My contractor said I have no other options and for 1/2'' pipes these are standard fittings that are used everywhere.
Anyone knows plumbing here and could comment on this? Are there different fittings that contractors should use so that watter flow is not reduced?
10 replies
Deal Addict
Jan 19, 2011
2952 posts
1182 upvotes
the openings insider your shower control valve and mixing valve are smaller even than the ID of a pex fitting.

I used pex throughout for a major main bath renovation a few years ago, but ran pex for my walk in shower direct from a manifold in the basement without any junctions. Provided there are only a couple of pex connectors at most between a main line and your shower valve, you will be fine.

When I run my shower, the rain head and handheld get really good flow, and both work fairly well when the mixer valve is split between the two

you have nothing to worry about.
"The truth is incontrovertible, malice may attack it, ignorance may deride it, but in the end; there it is."
Just a guy who dabbles in lots of stuff learning along the way. I do have opinions, and readily share them!
Deal Addict
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Dec 10, 2008
4840 posts
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No other option? LOL

Run 3/4 pex
Use a different type of fitting like Uponor
Run copper

Would love to see what crimping technique they're using
Let's hug it out
[OP]
Member
Nov 17, 2016
288 posts
177 upvotes
RCGA wrote: No other option? LOL

Run 3/4 pex
Use a different type of fitting like Uponor
Run copper

Would love to see what crimping technique they're using
Here is how shower connectors look like:
shower.jpg

I checked hand shower connector and it definatelly has very small opening, much smaller than internal diameter of pipe. But 12'' raindrop shower head has bigger opening, but is is rated for 2GPM.
Deal Addict
Jan 19, 2011
2952 posts
1182 upvotes
Here's how I did mine:

short copper stubs soldered into my valves then soldered to inline Pex connectors, curved bends, no excess Pex connectors at all.

Image
"The truth is incontrovertible, malice may attack it, ignorance may deride it, but in the end; there it is."
Just a guy who dabbles in lots of stuff learning along the way. I do have opinions, and readily share them!
Deal Fanatic
User avatar
Oct 12, 2007
5215 posts
2592 upvotes
Ottawa
I wouldn't worry about flow restriction or pressure decrease from the pex fittings in a shower. Short distances of restriction don't really restrict either the flow or the pressure noticeably in most applications. The best set-up with pex is 3/4" or even using 1" trunks with 3/4" or 1/2" branches. But seriously, those are really only needed for bathtubs and (possibly) exterior hose bibbs. IMHO.

What strikes me as surprising in your picture is that the supply lines appear to be copper and then they convert to pex just before the mixer. I would have been tempted to go copper the entire way.
[OP]
Member
Nov 17, 2016
288 posts
177 upvotes
fieldhousehandyman wrote: Here's how I did mine:
short copper stubs soldered into my valves then soldered to inline Pex connectors, curved bends, no excess Pex connectors at all.
This looks much better than mine.
[OP]
Member
Nov 17, 2016
288 posts
177 upvotes
CaptSmethwick wrote: I wouldn't worry about flow restriction or pressure decrease from the pex fittings in a shower. Short distances of restriction don't really restrict either the flow or the pressure noticeably in most applications. The best set-up with pex is 3/4" or even using 1" trunks with 3/4" or 1/2" branches. But seriously, those are really only needed for bathtubs and (possibly) exterior hose bibbs. IMHO.

What strikes me as surprising in your picture is that the supply lines appear to be copper and then they convert to pex just before the mixer. I would have been tempted to go copper the entire way.
Thanks! This bathroom previously had bathtub that now is converted to shower. So coper pipes were used in old setup and contractor added PEX pipes from old pipes to reach shower valve.
[OP]
Member
Nov 17, 2016
288 posts
177 upvotes
Thank you very much for replies. This shower will stay as is, as draywal is already in place. But next (when this shower is doen) I will be doing main bathroom with another shower and bathtub. All info I got here is extremely helpful.
I'll talk to contractor about 90 degree bend guide instead of elbow.
Also, for master bathroom I want to make sure that flow into bathtub will be maximum as my bathtub filler support up to 5gpm flow, so clearly 1/2'' PEX piles are not good enough for that as they can handle just 2.3gpm
Deal Addict
Jan 19, 2011
2952 posts
1182 upvotes
Vi20161128 wrote: This looks much better than mine.
I did it myself, and took at least twice the amount of time a contractor and trades would have taken. I expect my results to be at least as good as an absolute minimum.

Your setup is fine, I mean I would have opted to curve the pex in instead of use elbows, but you will have no issue with flow.
"The truth is incontrovertible, malice may attack it, ignorance may deride it, but in the end; there it is."
Just a guy who dabbles in lots of stuff learning along the way. I do have opinions, and readily share them!
Deal Addict
Nov 18, 2005
4994 posts
1377 upvotes
Kitchener
Top is pex and fitting, middle uponor expansion pex and fitting, bottom copper pipe and fitting.

Screenshot_20180122-183646.jpg
Ask if he can install 90 pex bend supports instead of using a fitting
32998071.jpg

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