STAINLESS STEEL TYPE TOTAL: 4 View: 1/2" DOUBLE DIAPHERAGM PUMP Model : DP-4SS(StainlessSteel) 3/4" DOUBLE DIAPHERAGM PUMP Model : DP-6SS(StainlessSteel) 2" DOUBLE DIAPHERAGM PUMP Model : DP-88SS(StainlessSteel) 1" DOUBLE DIAPHERAGM PUMP Model : DP-8SS(StainlessSteel)