Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M12 3 4IN 150PSI 3EXT found under Valve Relief Pressu by Watts Regulator Co. The National Stock Number assigned to this part is 4820012082790, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like M12 3 4IN 150PSI 3EXT.