PUMPS PARTS MATERIAL USED Bush Leaded tin bronze 4 Bowl (V3 & V4) F-Tech diffuserbowl are made from GFN-3 Vergine (Noryl) With Stainless Steel Jacket. V3: OD 64.5mm & 69.5mm Model: F2, F4, F5, F7, F10 V4: OD 81mm Model: F1, F2, F4, F5, F7, F10, F12,...