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 simplified due to the 360º rotating top chamber and both in- and outlet connectors. For optimum silencing of exhaust noise you can also use a VETUS muffler and gooseneck, after the waterlock. Type NLP40 has an exhaust hose with inside diameter of Ø 40 mm with a capacity of 4,5 litres Comes with 2 securing straps. Including mounting brackets for bulkhead or floor mounting.