In-Line Check Valves can be used to keep your pump primed, increase pump lift or prevent backflow.Bosworth Sea-lect In-Line Check Valves feature durable, lightweight Acetal plastic bodies. Suitable for use with manual or electric pumps. Must use hose clamps or PVC fittings.Key FeaturesCreates and maintains pump primeDoubles pump lift for Guzzler 400 Series pumpsPrevents fluid backflowDurable, lightweight Acetal plasticCompatible with Guzzler 400 Series pumps