50 Pack Power Pressure Washer O-Rings for 1/4”, 3/8”, M22 Quick Connect Coupler, by | Jul 21, 20262 sizes O-ring designed for 1/4”, 3/8”, M22 quick connect fittting. O-rings designed for 1/4”, 3/8”, M22 quick connect fitting. 25 x O-rings for 1/4” and M22 fitting: OD:14.0 mm, ID: 9.2 mm. These O-rings made of NBR rubber.