MAX4 Maxadaptor 4 in Sewer Repair Coupling Robust, compact repair coupling for most types and sizes of gravity flow, non-pressure sewer/drainage pipes. One coupling per nominal diameter joins clay, ductile iron, asbestos cement, cast iron and plastic.Corrosion Resistant AISI 304 Series Stainless Steel Click-Lock Clamping SystemHigh Impact Polyamide (Nylon) Securing CageInjection Molded EPDM Rubber Sealing Gasket