The Monument Air Bag is a durable, quality, flexible drain plug for plugging drains and pipes. Fitted with peripheral ribs that give a better seal and grip on the tube or pipe being repaired or replaced. It has a long feed hose that is fitted with a Schrader valve to quickly release the pressure. For use with Monument drain testing equipment. Inflate with MON1308 pump. Specification: Size: 100mm (4in)Maximum Inflation Pressure: 0.59 bar / 8.5 psi Ref: UTTK9573