NSF-61 Certified EPDM, Full Face Gasket, Pipe Size: 1 1/2(1.5) Inches (3.81Cm), Thickness: 1/16(0.062) Inches (1.5748mm), Pressure Tolerance: 150psi, Inner Diameter: 1 29/32(1.90625)Inches (4.841875Cm), Outer Diameter: 5(5)Inches (12.7Cm), With 4 - 5