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Sandblasting couplings,Q, are designed to connect sand blast hoses with sandblasting nozzles. The operators need to hold the hose tight to end of fitting, insert screws and turn in full to fix. Nozzle holders, HE, and sand blast female adapter, SB, are with NPT or NPSM female thread. Sandblasting couplings are made by aluminum, brass, or Nylon.