ZURN WILKINS 12-P1500XL 2471324 P1500 Calibrated Pressure Relief Valve, 25 To 175 Psi, 1/2" Mnpt x 1/2" Fnpt, Lead Free Wilkins P1500 calibrated pressure relief valve, 25 to 175 psi, 1/2 in. Mnpt x 1/2 in. FNPT, Lead free Vacuum relief valve: Vr10 The product is manufactured in United states