Use schedule 80 male adapters on the intake and discharge side of the pump, If the pump unprimed the schedule 80 will not melt like schedule 40 will. Dry fit the male fitting into the pump to determine how much Teflon tape to use then put on the Teflon tape (not to much, to much could split the pump) then put Permatex #2 on the male threads and thread adapters onto pump.