... beow: DI in below drawing : ID of boron carbide nozzle, 8mm D2 refer to ID of bellmouth orific ,12mm 18: refer to OD of boron ... carbide layer, 18mm 22: refer to ID of chrome-plated ... nozzle, including thickness of nylon gasket ,22mm G3/4"-14 refer to the thread size 3/4".14tooth.also OD of whole nozzle ...