Plumbing with PEX, which option to choose

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Supperfly17

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Hi there, I need to PEX my basement bathroom. I am going to tap into the line that comes out of the hot water
tank and the cold line. Which option would be better.

Option 1: insert a PEX insert with 3 nipples and feed 3 and 2 lines for vanity, toilet and shower

Option 2: insert a PEX insert with 1 nipple and split later on, when it gets closer to shower, sink and vanity

Thanks.

Option 1
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Option 2
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Jadnashua

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The ID of a 1/2" pipe is about 1/2 of the area of a 3/4" pipe...IOW, a 3/4" pipe can flow nearly twice the volume without pressure drops or excessive velocities, which can become an issue with noise and even durability long-term.

But, depending on your usage, you may not be using multiple things in the bathroom simultaneously. To be safe though, it's a good idea to run direct lines to the shower. If the vanity or toilet get a little slower by sharing their supply, it wont' be as noticeable verses your shower performance.

Given the three types of PEX, I prefer PEX-A, which is the most flexible. This also allows the use of expansion fittings which also have less flow restriction. The fittings for types -b and -c are small enough to be pushed into the pipe end, then are clamped in place. Those used on -a, won't fit into the tubing unless you use a special tool to expand it. Then, after a short delay, the tubing collapses to its original size, locking it onto the fitting. As a result, the ID is larger.
 
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Supperfly17

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Thanks for the reply. Yes im using pex-a and its all 1/2 inch pipe. And you recommend option 1?
 

Supperfly17

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Also am i allowed to tap anywhere into existing pex piping for my bathroom lines? Are there any rules where on is and isnt allowed to tap into?
 
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