Brass body. Hygroscopic safety air vent cap for code 502043A and 5021113A. Other 5020 and 5021 models provide black plastic air vent cap. Max working pressure: 150 psi Max discharge pressure: 32 psi Max discharge rate: 1.75 SCFM Max working temp: 5020 series 250°F; 5021 series 230°F