Every Valterra valve needs to have a square-flanged ABS fitting bolted to it on both the upstream and downstream sides. You can choose from hub, spigot or threaded versions. The flanged fittings bolt on with the four bolts and nuts that come with the valves.
This spigot version of the valve flange is used attach a hub (or socket) to your Valterra valve. a spigot is the same inside and outside diameters as pipe. So a 3" spigot is the same size as 3" pipe. It is solvent welded directly in to the hub fitting.
It is available to fit any of the Valterra valves, either in 1-1/2", 2" or 3" diameters.
