Coupling Fitting | Type Rigid, Import, Lightweight, Straight | Size A 4 Inch | Size B 4 Inch | Schedule 10, 40 | End Connection Grooved x Grooved | Material Ductile Iron | Material Specification ASTM A536 Grade 65-45-12 | Process Cast | Finish Orange | Pressure Rating 300 PSI | Gasket Supplied Yes | Gasket Details Pre-Lubricated Grade A Violet EPDMA Gasket | Application Fire Protection | Applicable Standard UL, ULC, FM, VdS, LPCB, ANSI | Maximum End Load 4771 Pound | Maximum End Gap 0.06 Inch | Tensile Strength 65000 PSI | Yield Strength 45000 PSI | Elongation 2 Inch | Bolt Size (2) 3/8 Inch Diameter x 2-1/4 Inch Length Figure 577 Rigid Coupling Provides a Rigid Joint by Firmly Gripping along the Circumference of the Pipe Grooves | The Figure 577 Light Weight Rigid Coupling is a Proven Dependable Method of Joining Pipe and is an Economical Alternative to Welding, Threading or Using Flange