Large 3" water lock, very sturdy constrution. Can be fitted to a wide range where wet exhaust is used. Fits 3-4" hose, in stock ready for immediate despatch. Measures aproximately 800mm long including hose connections 300mm wide 400mm high maximum measurements, we have a wide range of parts for all your boatbuilding needs. If its a new build boat, a refit, a simple modification or repair we can supply all the parts and information you will require, please phone for details and helpful advice.