Amazon.com : Captain O-Ring - Power Pressure Washer O-Rings for 3/8" Quick Coupler, High Temperature Viton FKM (10 Pack) [1/2" o-Rings to fit 3/8" QC Fittings] : Garden & Outdoor
Static O Ring SOR Pressure Switch and 10 similar items
Static O Ring Pressure Switch, Model # DPS-409-2 , Explosion Proof (A1) | eBay
Best Pressure Switches - Buying Guide | Gistgear
Static O Ring SOR Pressure Switch and 10 similar items
Best Pressure Switches - Buying Guide | Gistgear
Amazon.com: M MINGLE Power Pressure Washer O-Rings for 1/4 Inch, 3/8 Inch, M22 Quick Connect Coupler, 40-Pack: Garden & Outdoor