Premium's replaceable rubber pistons are made with nitrile rubber to resist extrusion and abrasion. These pistons are fully interchangeable with most other manufactures products. Available sizes are from 3″ through 7½″ and series are A, B, K and L. If flange is not worn past these marks, rubber kit can be installed
Fabric anti-extrusion device reduces extrusion of the rubber even at maximum pressure rating

Features:
- High tensile strength
- Rated for all drilling operations
- Maximum operating temperature is 250°F
- Extended service life