To use the valve, gently push the deflated bag down into the toilet under the water level, into the U bend at the bottom of the toilet. The hose which is attached to the rubber bag goes under the toilet seat and rests to the side of the toilet. Connect the valve of the hand pump to the valve on the hose and simply pump up the bag until it is totally inflated and firm to the touch, being careful not to over pump. (This works using the same method as pumping up a bicycle tyre).

At the maximum inflation the sealing area will be severely restricted reducing the maximum allowable back pressure

Once the threat of sewage backflow has subsided, simply deflate the bag by applying pressure to the pin on the valve of the hose. This can be done by pushing your finger or thumb onto the pin of the valve to let the air escape from the bag. Remove the bag and hose from the toilet and rinse off using a mild detergent. Allow to dry and store away.