Vetus plastic aerator with valve 38mm Aerator ASD type H is connected to a hose with a board passage in the hull. This ensures a constant overflow of cooling water through this hose with the engine running. Model H is supplied complete with diffuser, hose clamps and 4 m of hose. In short: Aerator type H with aeration hose E in aerator which is connected to a hull diffuser via a hose. This model is supplied complete with diffuser, hose clamps and 4 m of hose. Inner diameter 13, 19, 25, 32 mm