... ,Anti airlock protection 4,Stainless steel shafts SEAFLO 500GPH Mini Sea Water Pump for Marine/AquariumProduct DescriptionQuality bilge pumps you can ... .Material:1,Pump body: Thermoplastic2,Moisture tight seals against the salt water3,316 stainless steel shaft for corrosion-resistance.4,Quality ... : red, blue, black or requiredCertificates: Rohs/CE/ISO9001:2000 500GPH Sea Water Pump for Marine/Aquarium