Check the listing for details. Cherne 270-067 Single Size 6" Test Ball. Condition: New. Listed at 118.00 USD. Cherne 6" Test Ball New, single size 6" Cherne brand sewer test ball with instruction manual for air testing sewer pipe. Made from natural rubber in the USA and molded with Cherne's trademark rib design. Lightweight, tough and tar resistant, this plug will work in a variety of non-ideal conditions, including out-of-round pipes and live manholes. Can be used as a back plug in a pressure test or a sewer flow blocker. Each plug is brand new and comes with a 2 year manufacturer's warranty. Features: Comes with removable 7" ring and chain for pull/lift line Safety book included Removable tire inflation valve with cap Specifications: Minimum pipe diameter 5.44 inches Maximum pipe diameter 6 1/4 inches Proper air pressure 30 PSIG Maximum back pressure 13 PSIG Inflation pressure 25 PSICherne 270-040 Single Size 4" Test BallNew, single size 4" Cherne brand sewer test ball with instruction manual for air testing sewer pipe. Made from natural rubber in the USA and molded with Cherne's trademark rib design. Lightweight, tough and tar resistant, this plug will work in a variety of non-ideal conditions, including out-of-round pipes and live manholes. Can be used as a back plug in a pressure test or a sewer flow blocker. Each plug is brand new and comes with a 2 year manufacturer's warranty. Features: Comes with removable 5" ring and chain for pull/lift line Safety book included Removable tire inflation valve with cap Specifications: Minimum pipe diameter 3.41 inches Maximum pipe diameter 4 1/4 inches Proper air pressure 30 PSIG Maximum back pressure 13 PSIG