Dixon L03 Ductile Iron Series L Pipe and Welding Fitting, Quick Release Coupling with EPDM Gasket, 3" Size x 3-1/2" Pipe OD Coupling for connecting and extending pipes going in the same direction Nut and bolt connection with EPDM rubber gasket for high elasticity and resistance to abrasion and impact forces Ductile iron for high tensile strength with rust-inhibiting paint Maximum operating pressure of 300 psi Underwriters Laboratories (UL) listed and Factory Mutual (FM) approved for quality assurance