The Monument 1290 is a 100 mm. (4 in.) durable quality flexible drain plug for plugging drains & pipes. This plug is fitted with peripheral ribs this will give a better seal & 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. Maximum inflation pressure 0.59 bar/8.5 psi. Inflate with MON1308 pump.