Package includes 2 self-closing marine drain valves designed for use at sea. Made from high quality ABS plastic, they offer strong resistance to water and weather conditions and are essential for boat, yacht, or RV drainage systems. Benefits and features - Prevent backflow: innovative check valve with rubber pad blocks return flow, keeping cabins and interiors dry even in harsh water conditions. - Effective drainage: allows water to drain efficiently while preventing reverse flow. - Lightweight and unobtrusive: each valve weighs about 25 g, minimizing vessel weight while maximizing performance. - Aesthetically compatible: white color blends with most boat aesthetics; plastic cover with check valve mechanism provides reliable operation in varied water conditions. Specifications - Material: ABS plastic - Number: 2 pieces - Diameter: approx. 71.3 mm - Height: approx. 8.4 mm - Installation: screw-on mounting; secure attachment with standard tools (no special tools required) - Compatibility: fits standard drain openings on most boats, yachts, and recreational vehicles Design and compatibility - Practical design suitable for marine environments; white finish integrates with typical vessel styling. - Simple installation via screws for a secure fit; no special tools required. Use scenarios - Boat cockpit drainage: connect to scupper drains to vent and drain spray or rainwater while preventing backflow into the cabin. - Yacht bilge or interior drainage: install in drainage lines to keep floors dry during rough seas or heavy rain. - Recreational vehicle exterior drains: use on RV exterior or utility drains to manage water flow without permitting backwash into living areas.