An o-ring is a gasket that is ring shaped with a circular cross section and made of pliable material. O-rings are used to seal connections with the trigger gun, pump, hose and wand of the pressure washing machine. O-rings help provide a seal between the gun, pump, hose and wand to the pressure washing machine as a whole. They help ensure that no water or other materials can get in or out. 

With our 30+ years of experience in the pressure washing industry, we have found that the best place for us to buy o-rings is at Hydra Pac Seals Inc in Salt Lake City, Utah. Our go to one are the 90 durometer rubber o-rings. Click on this link to head to their website directly.