Bellow Hole Size 80mm diameter. (natural length not compressed or stretched) Secondary Coupling Length 1m. High visiblity yellow secondary coupling. Thicker 3mm cable for extra strength.The ideal way to refresh your trailers braked coupling. Will fit trailers with the standard 50mm tow ball coupling. Will not fit trailers with towing ring or nato ring couplings. Please note; We have made every effort to ensure these parts are correct for your trailer, however it is essential to check all parts are identical to the original ones before fitting. Trailers are not as standardised as cars and occasionally variations do occur. The item "Service Kit for Bradley 3500kg Braked Trailer Hitch Coupling Damper Bellows" is in sale since Tuesday, October 19, 2021. This item is in the category "Vehicle Parts & Accessories\Commercial Vehicle Parts\Trailers/Transporters\Trailer/Transporter Parts". The seller is "abtools_uk" and is located in Stoke-on-Trent. This item can be shipped worldwide.