Black O-ring is used on the following pumps: ePump (All HP), ePump+SVRS, VS PlusHP, Stealth (0.5hp - 3.0hp, and 5.0hp), PlusHP (All HP), WFTR (All HP), SWF (All HP), FloPro (.075hp - 2.5hp), VS FloPro (1.65hp), VS FloPro (2.7hp Models VSFHP270AUT,...
