Supco rlc051 waterless trap for condensate lines allows liquid condensate to drain from residential systems and prevents air from entering or escaping from the equipment. features/ benefits air-trap will never freeze and break. no more issues caused by traps drying out. predesigned to prevent field errors. reduces trap height by up to 60%. eliminates sludge build-up at bottom of u tube. no more geysers under negative pressure. no more blow through under positive pressure. slip internal or 1 fitting external connection- with bushings can connect to , 1.25, 1.50 and 2 tubes.