[villagetinker]

Originally Posted by deej012160

Has anyone replaced one of their sink isolation valves (the ones that "pop" open & closed)? Are they soldered/sweated in, screwed in, other? TIA!!

All of the pop off valves I have seen are plastic (PVC I think), if you go to ACE hardware (Wildwood) there was a gentleman there who explained in detail how to do this with the sharkgrip replacement valves. I have not done this yet as I was actually looking for replacements for a slightly different installation.
What I was told, was the existing pop off valves are a twist off type design.
Be sure you turn off your main valve (in the garage), and open both cold and hot water valves to relieve pressure in the system before you start to work on your valve replacement. One of the neighbors had this done, and as I recall the plumber charged over $50 valve. If you are not comfortable doing this yourself, call around and get estimates before you hire a plumber.