Camco 90degree PROPANE TEES. Connects to camper or trailer propane cylinder to allow connection of an additional propane appliance such as a tabletop grill. Camp stove or lantern. Provide thermal protection in case of fire and excess flow protection in case of broken gas line. 57591 is the 90 degree propane tee only (Type 1 ACME nut x female POL and male ACME thread x 1-20 male throwaway cylinder thread.