When it comes to buying quad rings, custom o rings, neoprene o rings, teflon o rings, and nitrile o rings, what you need is to ensure that you get value for your money. Unfortunately, that might not be as easy as you think. There is the effort that goes into the entire process. You will need to ensure that you purchase the quad rings from a reputable supplier. This can be a great challenge. If you intend to purchase the quad rings for the first time, you might end up getting a substandard quality. This is a likely scenario since you might not have on your mind some of the best suppliers of quad rings. Therefore, there is a tendency of being impulsive and easily shop from the first supplier that comes up.
A quad ring seal is important since it is used on many KNP engineering spin-on filters. This ring is made up of a square gasket with little o rings on every corner. Once you cut it apart, it resembles an X whenever you look at its cross-section. Whenever there is a tear or leakage, you will spot the tear and a little o ring. There is the opportunity to turnover the quad ring units housing to get a fresh side of the seal to use or take it away and replace it with the spare quad ring that comes with it.