NANPU LR Series Air Regulator regulates the compressed air supplied to the set working pressure and compensates for fluctuations in pressure,sincerely hope to meet your needs, the regulator use high quality materials and sophisticated machining, operating pressure up to 230 psi, the best choice whether for household or industrial use. Specifications: Housing: Zinc Die-Casting; Metal Bowl Guard: Aluminum Alloy Sealing: NBR Adjusting Knob: POM