Professional grade friction ready pliers allow you to customize the friction selection for the application in hand a smart way to manage inventory. 100 Pressure tested, reliable operation and leak-free performance. Materials match OE: Vehicle-specific cast iron or aluminum designs to OE specifications. EPDM Rubber Components: Superior resistance to corrosion and heat runaway. Easy installation: fully assembled; bleed screws, copper sealing washers, and mounting brackets. Smooth Operation - Critical areas are pre-lubricated with a high-temperature synthetic lubricant. Hole diameter: 1.81 in. Inlet Thread Size: 38-24. Thread Size: 38-24.