Pneumatic Butterfly Valve Action Spring Return Body Material Stainless Steel Pipe Size 4 in Connection Clamp Max Water Pressure 145 psi Seat Material Viton Compliance FDA Approved (Seats and Seals) 3A (Surface Finish) USDA (Surface Finish) FDA Standards (Surface Finish) Standards FDA Approved Air Inlet Pressure 108 psi Product Type Butterfly Valve Surface Finish 32 RA I.D.