Wade Rain "D" Series (inward opening) Hydrants, T-Valves & Openers provide an On / Off Conection between pipes.
Provide an On / Off connection from buried PVC pipe to above ground aluminum irrigation pipe. Wade Hydrants are usually mounted on steel risers
Provide an On / Off connection from an above ground aluminum irrigation pipe to second line of irrigation pipe. For example a header / main line of pipe runs across the top of a field; coming off of the header pipe are lateral lines of pipe with sprinklers. T-Valve connection allows sprinkler lines to be turned on and off without shutting down the pump.
Open and close Hydrants & T-Valves, by pushing down on disc that lets water flow through, closing let's the disc come up and seals shut.