Cherne 262048 Muni Ball Test Ball Plug, 4 in Pipe, Pneumatic, Bypass, Rubber 2017502 A cap seals the bottom A cap seals the bottom of the gun to create vacuum pressure and to prevent grease from leaking and making the gun slippery Flange Material Finish Zinc Plated Testing Maximum Back Pressure (Air) 22 psi Plug Seal Material Natural Rubber For Use On Sewers Bypass Connection Type NPT Head Tether Connection Eyebolt Includes Protective Sleeve No Inflation Fluid Air Contains Pressure Release Valve No Bypass Thread Gender Female Maximum Back Pressure (Water) 50 ft of head Restrictions This item is restricted for conveying or dispensing water for potable use (human consumption) For Maximum Pipe Inside Diameter 4