The Sentry 2-CS Reducer bushing is the simplest of the secondary seal assemblies. It consists of reducer bushing body, (2) CS Seals in the I.D. of the bushing and a snap ring for retaining the bushing in the secondary seal area of a casing spool or tubing head.
This design consists of two “CS” seals located in grooves in the I.D. of the reducer bushing body
A seal is achieved by interference of the seal with the outside diameter of the casing and the I.D. of the seal groove
A spring molded in each ID corner of the seal provides the anti‑extrusion mechanism when sealing against the casing O.D
The shape of the seal allows it flexibility to maintain interference with normal manufactured tolerances of the casing O.D
Is utilized in the bottom of a casing spool or tubing head that already has (2) “CS” seals in the secondary seal area