A Dowty seal is a washer usually made of aluminum or copper and occasionally steel. Unlike an original crush washer, however, this product has a rubber lip on the inside diameter. A Dowty seal is essentially the same thing as a bonded washer, and is used in high pressure applications where other means of closing off are ineffective. Most types of Dowty seal and bonded washers are now available in a self-centralizing form, which eliminates the offset of the closure and makes installation that much easier. Since they're available in standard, German and French metric sizes, you're sure to find one that fits your projects needs. Shop with EORings.com and find a great price on your Dowty seal products.