The sinuses are air-filled cavities. 1  They are located: 2  Within the bony structure of the cheeks. 3  Behind the forehead and eyebrows. 4  On either side of the bridge of the nose. 5  Behind the nose directly in front of the brain.
An O-ring is a round ring that is used as a gasket for sealing a connection. O-rings are typically constructed out of polyurethane, silicone, neoprene, nitrile rubber or fluorocarbon. These rings are commonly used in mechanical applications, such as pipe connections, and help to ensure a tight seal between two objects. O-rings are designed to be seated in a groove or housing that keeps the ring in place. Once in its track, the ring is compressed between the two pieces and, in turn, creates a strong seal where they meet.
The oil filter with the o ring near the bottom is not compatible with any ram engine. It only worked for the 2014 jeeps. I helped design the champion filter. The o ring near the top is for all engines now. Using the o ring filter near the bottom of the neck in a ram engine will allow all dirty oil straight into the engine. It does not seal at all. Fca had canceled that design and is only using and making the o ring filter near the top for all engines.