Repair Clamp: For 4 in Pipe, 3 in Overall Lg, 304 Stainless Steel, Nitrile Rubber GasketRepair Clamp: For 4 in Pipe, 3 in Overall Lg, 304 Stainless Steel, Nitrile Rubber Gasket Item 4NWR5 Mfr. Model 24500045003000 These repair clamps are lined with a partial gasket to seal pinholes or punctures in a tube or pipe. They are installed by bolting and tightening the clamp ends together which seals the gasket against the tube or pipe surface. Brand SMITH BLAIR Bolt Material Steel Gasket Material Nitrile Rubber For Pipe Size 4 in Maximum