These float operated poly supply valves have been used in the agricultural industry for years providing very good results in all areas with minimal maintenence. They each utilize a 3/4" inlet size for easy connection and quick recovery time. The brass float arm can be readily adjusted to maintain ideal liquid level just by manually changing the curvature of the brass connecting rod between the valve and the float ball. The two valves pictured here are direct replacements for the smaller PHW series water bowls (RXTVHP20SA) and the TTW series round water troughs and large water bowls(RVPTV20LSA)