Bonded seals is a static seal which are used as a sealing ring fitted under bolt head & nuts,is also known as Dowty Washer comprises a metal washer and an elastomeric ring bonded inside the diameter, bonded seals commonly seals between bolt head and body. In BSP fitting Dowty Washer are used to seal the connection at the face of the female port. Bonded Seals are available in metric and inch dimensions.