Installing a functioning check valve in the right places on board can be essential. Non-return valves allow liquid to flow in one direction only, thus preventing water flowing back onboard unnoticed. Various manufacturers such as Jabsco, Plastimo, Whale or Truedesign offer check valves in different sizes and materials. Whether you are looking for a one-way valve for a fuel line, a non-return valve with hose thread or an NBR seal, in our online shop you'll find great offers for your on-board project.