i can tell you the one on the pin keg with no discons attached when the nut cracks or the thing leaks, no longer available. the bottom style is ~$8 for it. drawn 304. i have thought of just welding a plate on all of mine since i can't fill the ~1 1/4 hole with any other style relief valve.
"Back when I was in the pen, I used to beat my meat..."
"Damn ye, yellow-bellied sapsuckers; I'm a better man than all of ye milksops put together" - Blackbeard
"...I have really good sex moves; that I learned in China. I'm a sexual tiger; and feed on va-gine-a." - Jon Lajoie