How far down do I tighten Flair-It Pex Fitting nuts?

Question

How far down do I tighten Flair-It fitting nuts?

Flair-It Team

Tighten them down until they squeak. With Polybutylene Pipe there should be about 2 threads showing with PEX pipe 2-3.  
Posted on Sat, December 1, 2007 by Brit

4 comments (Add your own)

1. Bob Koretsky wrote:
I purchased a BestPEX Manifold 20 Port with 1/2" Crimp Valves, and the crimp valves are not installed on the manifold body. The above question and answer does not help me to determine how far I should tighten each of the valves( which has a Flair-it fitting on one end) onto the manifold. I'm assuming that the manifold components are made of Polybutylene, but when I tighten them onto the manifold body within 2 threads, they don't squeak. It might be helpful to have some sort of more technical description which defines how many of the threads need to be engaged on the plastic side of the valve, not on the brass side. The pipe thread on the plastic side looks like a tapered pipe thread. It's funny that when I was working with galvanized iron, I could not find a rule-of-thumb description of how far to tighten the iron fittings onto pipe. I settled on approximately 1/2" of thread engagement.

Wed, January 23, 2008 @ 8:20 PM

2. robert knight wrote:
Confused. Have 1/2 O/D inside 3/8 I/D polybutylene pipe. Need to repair. Do I buy 1/2 flair-it fittings or 3/8.

Sun, July 20, 2008 @ 10:21 AM

3. Ed Gillis wrote:
You would use 3/8; the tube and fitting size is determined by the inside diameter of the tubing or pipe for potable (drinking) water. This would include galvanized pipe, copper, pvc, cpvc ,polybutelene, or pex.

Thu, September 18, 2008 @ 3:57 PM

4. George wrote:
I will be replacing an existing stop valve and riser to my toilet. Need to know how your pex riser connects to the toilet ball cock. I will be using the Flair-It stop valve with the F-nut. I understand that the one end of the riser fits into the F-nut. Can the existing nut that is connected to the ball cock be used on your pex riser?

Thanks

Mon, January 2, 2012 @ 3:58 PM

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