This is a product that glues the rubber (protection cap) in a simple way so that the joining works for the manhole and connection pipe can be done.The nonwoven fabrics are adhered to the inner surface of the rubber (protection cap), so after the nonwoven fabric on the opposite surface is peeled off and fixed, connection work with the connection pipe is made by impregnating the non-shrinking mortar in the middle of the rubber (protection cap), which makes it a very convenient product.