This 1/4 Pint of PVC comes with a lid mounted swab for applying it to the pipe when installing a central vacuum system. It is generally recommended to be applied to the pipe but not the elbow, coupler, etc. to prevent any beading on the inside which could catch dirt and fuzz. Twisting the pipe as it is inserted aids in the assembly and spreads the cement more evenly. For similar products see our list of current Generic Central Parts & Components.