14 Millimeters

Included Components M22 14mm Male to Male Coupler x 1, M22 Female to 3/8″ QC Plug Adapter x 2, M22 Male to 3/8″ QC Socket Adapter x 2, Pressure Washer Hose 100 FT x 1. The coupler (M22 14mm Male to M22 14mm Male) is used for connecting two hoses.