Measuring PSI

[Marcel R. Cyr]

Same way, I would imagine.
Back flow valves allow water and pressure in one direction only.
With loss of pressure, the valve is in the shut position.
The anti-syphon works similar to block any backwater to contaminate the lines should pressure reduce inside the home plumbing.
Hope this helps.

[Brian E. Kelly]

Originally Posted by rwashington

What kind of verbage are you guys putting regarding the water supply PSI? I understand the scope is between 30 & 80. I'd like to tell clients something more than its within range if its say 40. Had a client concerned that since it was 40 that he would have a problem since it was near the low side. I always take mine at the hose bib closest the shutoff valve as well. Do any of you do differently?

What is the percieved up side of telling the client more?

Water presure can change through out the day at many locations.

As for using a cheap gauge, if your acceptable range is 50 psig, a cheap gauge is fine.

I point put regulators on the system and tell the client that if they notice a pressure change check the regulator and or call a plumber.