PRODUCT FEATURES Buna o-rings are standard o-rings in all quick connects. Reviews Featured Products 3/8" Couplers (25) Pack Buna O-Rings $5.33 Add to Cart 1/4" Couplers (25) Pack Viton O-Rings $11.45 Add to Cart 1/2" Couplers (25) Pack Viton O-Rings $10.50 $15.50 Add to Cart 22mm Screw Coupler Buna O-Rings $23.63 Add to Cart