.The Cetop Bonded Seal is a rectangular section metal washer to which a trapezoidal shaped rubber ring is bonded. (often called a Dowty Washer).
Both the washer and the inner are available in different materials to suit the application required the most common being mild steel and stainless steel with the inner rubber compounds being mainly nitrile, and viton. Most of our bonded washers are 540 UTS.
These suit the BSP threads but are smaller dimensions than the standard BSP range.