Sand Casting Pump Inlet Flange Grey Iron Checked by Go&no go gauge 4"NPT ... etc.3) Machining Types: Machined by Round Bar and steel plate, Drilling, Milling, Turning, Boring, Slating, Grinding,, NC/CNC Machining etc ... ,BS, JIS, UNI, ANSI, ISO etc. Sand Casting Pump Inlet Flange