Seaflo Vented Loop 38 mm (1.5 in) VL03 | 4BoatsSeaflo Vented loop 38 mm (1. 5 in) VL03 prevents siphoning in boat plumbing with a compact, corrosion proof plastic design. 38 mm (1. 5 in) hose size Internal check valve prevents back siphoning Eliminates need for external venting Corrosion proof plastic construction Suitable for bilge, sink and waste plumbing Easy inline installation; fits standard hose Model VL03; brand Seaflo Vented