Two 45's Versus One 90 Degree Fitting. - Plumbing - DIY Home Improvement | DIYChatroom
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Old 11-28-2016, 08:31 AM   #1
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two 45's versus one 90 degree fitting.


I'm running water line under my house and have to cut into the cold and hot lines, so I was wondering how much more resistance is created by one 90 degree fitting rather than two 45 degree fittings, or since I'm using PEX...I might have room to create a curve rather than either of the previous.

Anyways...is it worth it.

I would appreciate any helpful comments.

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Old 11-28-2016, 10:09 AM   #2
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Re: two 45's versus one 90 degree fitting.


The difference between two 45 degree fittings and one 90 degree fitting is so small you could not measure it. A gentle bend in PEX produces almost no friction loss, however the friction loss of either the ninety or the two 45's is small enough that it doesn't make any practical difference which way you go. If you want to see the psi loss through various fittings, check out this website, which gives you the loss coefficients for a variety of fitting types, for various sizes of pipe. http://www.metropumps.com/ResourcesFrictionLossData.pdf
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Old 11-28-2016, 11:50 AM   #3
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Re: two 45's versus one 90 degree fitting.


As Daniel noted, no real measurable difference.

But what is important.....the number of connections. Every time you have a connection you have a potential for leaks...and the labor involved goes up.

Which ever method gives you the least number of connections is the best way to go.
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