The PVC Solvent/Cement works. Aquaseal and similar products are urethanes (rubber) and will bond to the PVC coating on the lines. PVC Solvent/Cement melts the coating and then as the solvent evaporates the PVC polymers in the compound intertwine with the polymers in the coating. This is chemical welding, thus producing a "welded loop." Both cans in clear (other colours available), total cost under $6 CAN. It can be used as is and will keep for 3 years. The fumes are a little nasty, use in a well ventilated area.