A possible rewrite and conversion into a detailed paragraph is:
The Carlisle ST1 Side Seal Poly 2 Pk 336379 is a product that consists of a set of spare parts for the Carlisle ST1 Spray Foam Gun. This gun is a device that can spray polyurethane foam insulation on various surfaces. The side seal poly is a component that creates a tight seal between the gun and the mix tip, which is where the foam material is mixed and sprayed. The product includes two side seals and two o-rings, which are rubber rings that prevent leakage.
