Vetus NLP50 Waterlock Muffler, 2"Dual stage waterlock with 51mm hose connections, 4. 5 litres Waterlock muffler with dual stage construction. Superior silencing of exhaust noise with minimal back pressure. 360 rotatable top chamber and connectors Our NLP waterlocks are of dual stage construction featuring upper and lower chambers with a horizontal partition plate and a riser tube through the centre. The installation of the exhaust system, even in confined engine spaces, is greatly