Combining the functions of a muffler and gooseneck saves installation time and space while maintaining the essential qualities of a good exhaust system with impressive negligible back pressure. The gooseneck prevents water back filling the exhaust and the muffler creates additional water mixing to further reduce the exhaust noise.Specifications: - Suitable for Ø 40mm internal hose diameters- Fully rotatable sections and hose connections to ensure easy installation- Comes with a hose stub to connect the air vent- Function: Muffler + Gooseneck- Capacity (litres): 3- Inlet hose connection diameter (mm): 40- Outlet Hose connection diameter (mm): 40- Length (mm): 110- Width (mm): 110- Height (mm): 494- % Noise reduction: 25