Power diameter(mm) PVC shell length(mm) refrigeration inlet and outlet(mm) water inlet and outlet (mm) 1HP 160 350 12.7 50 1.5HP 200 400 12.7 50 2HP 200 400 12.7 50 3HP small 200 420 12.7 50 3HP big 315 400 12.7 19 50 5HP 315 600 12.7 19 50 10HP 400 600 12.7 19 50.