Sporlan 404380 RC 4864 HH Core Els PW 17895 Safety standards for sealed combustion Safety standards for sealed combustion require the gasket to be replaced whenever the burner access door is removed The Weil McLain 511 624 510 is a high precision pressure differential switch engineered specifically for residential and light commercial hydronic heating systems The Sporlan 404380 RC 4864 HH is a high performance activated charcoal filter drier core specifically engineered for aggressive system clean up following a hermetic motor burnout the Sporlan RC 4864 HH is compatible with most modern refrigerants and lubricants