The seals were made in Poland according to the design of the Serwis Wiatrowy. They stand out from their original counterparts by the precision of workmanship and the use of better and higher-quality synthetic materials.  That particular seal is compatible with the Theoben HL. The product has been precisely designed from the very beggining and manufactured with the highest quality standards. Our products are made by us from scratch, which results in a perfect fit of the product to the system. Outer seal diameter - 31mm. High quality and effectiveness guaranteed! *illustrative photo Unpacking the product from a transparent foil vacuum packaging means you waive the right to return the product.