This is all new all Stainless Steel Coupling Insert used to boost up your connection and your vacuum performance. We recommend the change of the "COUPLING BODY" when changing the "COUPLING INSERT"
MALE STAINLESS STEEL COUPLING - This is all new all Stainless Steel Coupling Insert used to boost up your connection and your vacuum performance. We recommend the change of the "COUPLING BODY" when changing the "COUPLING INSERT"