Made of rubber and brass for rugged, corrosion resistant construction Key benefits - Reliable leak resistant seal: cam style design provides an easy to use, tight long lasting seal - Simple, secure installation: mount from inside the transom for a clean exterior and protected sealing surface - Adjustable and vibration resistant: twist turn adjustment will not leak or jar loose under vibration - Versatile hole compatibility: suitable for 25 mm or 32 mm holes Features that matter - Material: rubber and brass for durable, corrosion resistant performance - Function: cam style fastening delivers a secure seal with easy operation - Mounting: internal transom mounting for protection and neat exterior appearance - Adjustment: fully adjustable twist turn mechanism maintains seal integrity in varying conditions - Size compatibility: supports 25 mm and 32 mm openings 2-3 practical use scenarios - Through transom installations: use for fittings or seals that pass through a transom opening and require a tight, adjustable seal from inside the boat - Retrofit or replacement: upgrade an aging or leaking transom seal on a 25 mm or 32 mm hole to restore reliability and reduce corrosion risk - High vibration environments: deploy in installations where engine vibration or pump operation could loosen a poor seal, ensuring a secure, long lasting fit