M22-15mm Female Twist Connect to 1/4" quick Coupler For Spray Tips Or Accessories If you have a Male M22/15mm a 3/8 pressure washer plug will fit in the bore. If the plug does not fit in the bore, you have standard 14mm High Quality, Commercial grade Some pressure washers use this larger inside diameter cone on the female twist connect end. Make sure to measure your fitting to ensure the size is correct. 14 millimeters = 0.551 Standard Inside diameter 15 millimeters = .590 This item inside diameter Rated to 4000 psi This Female M22 End is not a standard Karcher syle. The standard is M22 -14mm. This is a 15mm inside diameter 1/4" Quick Coupler x M22-15 Twist Coupler Socket Adapter. 15mm inside diameter Features: • Precision machined • Internal o-ring seal Will NOT work with garden hoses Specifications: • Max. Pressure: 4,000 PSI • Max. Flow: 10.0 GPM • Material: Brass