The Diyvac DV4 is a wet vac attachment to drain your air conditionings condensate drain line.It will remove algae and build up in just a few minutes and save you service calls from an A/C tech saving your potentially $100's of dollars.The green base will fit all brands of wet vac hoses .The black elbow fits into a 1 inch opening of your drain line.PLEASE MAKE SURE YOUR DRAIN LINE OPENING IS 1 INCH BEFORE ORDERING.Our patented Diyvac product is made in the U.S.A !!