Convenience: Very suitable for recreational vehicles, such as caravans, caravans, RVs, boats, work cars, portable toilets, outdoor areas and barbecues. Double-acting operation delivers water from top to bottom.Self-priming, convenient to fetch water anytime and anywhere. Product description: Features:Ideal for recreational vehicles such as caravans, caravans, RVs, boats, work cars, portable toilets, outdoor spaces and barbecue areas. Double-acting operation delivers water from top to bottom.Self-priming, convenient to fetch water anytime and anywhere. Rugged and durable metal structure. Easy to use. Manual water absorption:The suction pump should be pumped up and down by hand, which can help you exercise without consuming too much power. For many outdoor travel enthusiasts, it will be the most convenient pump. Its compact and practical design is deeply loved by many outdoor enthusiasts. When you need to extract 400ml of water, just press the pump 6-7 times to complete. It is a very effective life assistant. Specification:material: metal. White. Mounting hole diameter: 32mm. Tube length: 180mm. Include:1 x Hand pump for caravan sink