Webstone 41672 1/2-Inch IPS Pro-Pal Expansion Tank Pro Service Valve 1/2 FIP x MIP x FIP x Hose Expansion Tank 4 in 1 alternative replaces a ball valve + 2 tee fittings + a boiler drain Quickly connect entire system to the cold water feed Easily install, isolate, drain, and replace any expansion tank 1/2 FIP x MIP x FIP x Hose Expansion Tank 600 WOG 4 in 1 alternative replaces a ball valve + 2 tee fittings + a boiler drain Quickly connect entire system to the cold water feed Easily install, isolate, drain, and replace any expansion tank