Huge quantity: 2 sizes each, 25 spare parts, O-rings, sealing ring inside fittings for 1/4", 3/8" and M22 quick coupling 25 parts small O-ring size: outer diameter: 14.0mm; Inner Diameter: 9.2mm; Designed for 1/4 inch and M22 quick couplers 25 large parts: outer diameter: 17.1mm; Inner Diameter: 11.8mm; Fitting designed for 3/8 inch quick connect Water Saving: Save water by reducing your leaks with good quality O-ring. These are replacement o-rings that fit many pressure washer wands, hoses and quick connects. Note: Check your O-rings size before purchase Good quality: made of tear and abrasion resistant NBR rubber; Compatible with many connectors and cleaners, suitable for cold and hot water pressure washers