Hi All, Bear with me here as i'm a desperate man. After owning and doing a good portion of the maintenance on our own homes for the past 35 years I have a relatively decent amount of home repair knowledge. So after exhausting all my options which include already putting a few holes in the walls, I just can't seem to nail down the area where our banging pipe issue is coming from. Please understand that i'm familiar with the common fixes for banging pipes....shocks....chambers.....draining and refilling....etc....etc and have tried them all to no avail. I'm pretty sure the tool/help i'm for doesn't exist, but as mentioned, being desperate i'm hoping someone may have a "Trick of the trade" type of deal that helps someone pin-point where the banging pipe is so the number of access holes can be kept to a minimum. I've tried automotive type steths.....tried putting a glass up to my ear while holding it to the wall, and a few other goofy things. Any suggestions other than buying some new drywall and get to ripping out the old till I find it ?.......Thanks

I need to install a new prv in my house. I've put a gauge on a hose bib outside the garage and turned the adjusting screw clockwise but no change on the gauge. It stays at 90 psi, drops to 80 or so when running water. I am bleeding off pressure at another bib after each adjustment. So presuming I've done all I can I guess its time for a new one. The prv is threaded onto copper male adapter and has a union on the other end. Having the union is fine but I still have to spin the valve to get off the other fitting. I don't trust my sweating skills to try this the right way. So my question, finally, is can I unscrew the bonnet (cone shaped part of valve) off while taking off/putting on the new one without damaging the valve. It is too close to the wall to spin without taking it apart. This is a Watts 3/4 inch aub and is 5 1/4 inches end to end. If I can't find one with same dimension then its plan B anyway. Thanks!