Boat drain plug
Buy a drain plug for your boat at the best prices on the market here at Biltema. We stock steel and nylon anchors and expansion boat drain plugs, and you can see the selection on this page.
How does a boat drain plug work?
A boat drain plug (also known as boat bungs or transom drain) is an essential piece of equipment that ensures that water that has found its way into the boat from rain or waves can be effectively removed. This simple but vital component is designed to be mounted at the bottom of the boat, typically at the lowest point, so that gravity helps to drain the water out.
The bottom boat drain plug is only loosened when the boat is pulled ashore - never while the boat is in water. When the bottom plug is opened, it allows the water to drain out. Water should not be left in the boat for long periods of time, as it can cause mold, rot, and other damage.
Buy a bottom plug for boats at Biltema
At Biltema, you'll find a wide range of boat drain plugs for your boat to ensure you can keep your boat free from unwanted water. Our range includes bottom plugs made from durable materials such as steel, brass and nylon, each with its own outstanding properties.
In our selection, we have boat drain plugs in different sizes with diameters of 23-60 mm. Choose the right bilge plug for your boat at Biltema and enjoy the peace of mind of knowing you've invested in quality that lasts.
Should my boat drain plug be steel or nylon?
When faced with the choice between a steel or nylon boat drain plug, it's important to first consider your specific needs and the conditions the plug will be exposed to. Both materials have their advantages, but the right choice depends on the application and the environmental factors the bung will be exposed to.
Advantages of steel
Steel is very strong and durable, making it ideal for use in environments that require robust and durable components. Steel boat drain plugs can handle higher pressures and more extreme conditions than many other materials, such as extreme temperatures.
Steel has a high tolerance to mechanical stress, which is important in environments where the bottom plugs may be exposed to heavy impact or pressure. Although steel is typically susceptible to corrosion, surface treatments such as galvanising or using stainless steel can significantly improve corrosion resistance.
Benefits of nylon
Nylon is naturally resistant to corrosion, making it an ideal material for marine applications including boat drain plugs where salt water and humidity are common challenges. Nylon is significantly lighter than steel, which reduces the overall weight of the boat and can improve its fuel efficiency.
As a non-metallic material, nylon has good insulation properties, which can be beneficial in electrical installations and the prevention of galvanic corrosion. Nylon bottom boat drain plugs are generally cheaper and easier to install, do not require special tools and can be easily replaced or maintained.
How to empty your boat of water
To empty your boat for water using a boat drain plug, you need to start by making sure the boat is pulled ashore. Here, you can either place the boat on stands or trestles if you have them available. Locate the boat drain plug, which is placed at the lowest point of the boat's bottom. Carefully unscrew or pull out the bottom plug and let gravity do the work to allow the water to drain out. Remember to attach the bottom plug securely again before launching the boat to prevent water from entering while sailing.
Biltema has more than just a boat drain plug
At Biltema, you will find not only drain plugs for your boat but also a wide range of other boat plumbing products. Among these, you'll find boat toilets for comfort and hygiene. We also have a range of boat faucets to the maritime environment as well as boat plumbing hoses to handle the water supply and wastewater efficiently.
These products are just a selection of Biltema's extensive range, which covers everything you could need for plumbing work on your boat - all with a focus on quality and durability.
FAQ
How do I know what size boat drain plug I need for my boat?
Measure the diameter of the drain hole in your boat carefully. Common boat drain plug sizes range from 23–60 mm. Check your boat’s manual or ask an expert to ensure a proper fit and watertight seal.
What should I do if my boat drain plug is leaking?
If your bung leaks, inspect it for cracks, wear, or a damaged gasket. Replacing the gasket or the entire boat drain plug may solve the issue. When in doubt, consult a marine technician to avoid further water damage.
How do I replace a drain plug on my boat?
Ensure the boat is out of the water and dry. Remove the old plug by unscrewing or pulling it out. Clean the area, then install the new bung by pressing or screwing it in securely to create a tight seal.