Amanda Knapp
Installing a drain plug in a fibreglass boat is a simple project that can be completed in about 15 minutes. The process involves determining the location of the drain hole, usually low on the transom, and drilling a hole the size of the drain plug. The plug is then inserted into the hole and tightened with an Allen wrench, being careful not to over-tighten to avoid damaging the fibreglass. The plug should have a rubber gasket and be sealed with a waterproof sealant to prevent leaks. Drain plugs are essential for boats, allowing water to drain out and making it easier to clean the inside of the bilge.
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What You'll Learn
Choosing the right drain plug
Compatibility with Boat Type
Different boats have varying drain hole sizes and shapes, so it is essential to choose a plug that matches your boat's specifications. Measure the size and diameter of your drain hole and select a plug that fits snugly. A tight fit is necessary to prevent water seepage and ensure a watertight seal.
Plug Type
There are several types of drain plugs available, each with its own advantages:
- Screw-in plugs: These are widely used due to their ease of use and effectiveness. They feature a threaded design that allows for a secure fit and a tight seal. Screw-in plugs are available in various materials, such as rubber, nylon, and stainless steel, offering flexibility, durability, and corrosion resistance.
- Snap-in plugs: These plugs have a snap-on design, making them convenient and easy to install and remove. Snap-in plugs are often made of rubber, providing flexibility and a watertight seal. They are available in different sizes and diameters to accommodate varying drain hole specifications.
- T-handle plugs: These are popular among boat owners due to their ease of use. The T-shaped handle provides a convenient grip for secure insertion and removal. T-handle plugs are commonly made of rubber or nylon, offering flexibility, durability, and a secure fit.
Material
The material of the drain plug is an important consideration. Rubber plugs are a popular choice due to their flexibility, durability, and ability to create a watertight seal. They are affordable, user-friendly, and suitable for various boat types. However, rubber plugs may degrade over time due to exposure to sunlight and harsh weather conditions. Alternatively, nylon and stainless steel plugs offer increased durability and corrosion resistance.
Cost
Drain plugs vary in price, with some being more costly than others. It's important to consider your budget when choosing a drain plug. While more expensive plugs may offer additional features or enhanced durability, there are also effective and affordable options available, such as the Duckworks Nylon Flange Screw-in Drain Plug, which is easy to install and costs around $2.50.
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$18.99
Locating the drain hole
To install a drain plug in a fibreglass boat, you'll first need to locate the drain hole. The ideal location is low on the transom, close to the bottom inside of the hull. The right side of a vee hull is usually best, as most of the time is spent turning right. However, if you're unable to drill into the right side without removing the rudder assembly, you can opt for the left side, as one user did "out of laziness".
When you've decided on a location, place a piece of masking tape on the area to be drilled, aligning it with the bottom of the hull. Measure up from the bottom of the hull to 1/8" – this will be the bottom edge of the hole. This should put the bottom edge of the hole flush with the inside of the hull bottom. Now, measure up half the drill bit diameter from the first mark and make another mark on the tape. Make a cross-mark perpendicular to the hull bottom, as close to the centreline of the transom as possible.
Some people have expressed concern about drilling into fibreglass. One user said they wouldn't trust their boat or their life "to a plug threaded into fibreglass". However, another user commented that they've done it in the past without a problem. They suggest tapping the keel and tossing the plug in, and that if there are issues down the road, you can always go bigger.
Another user commented that they've installed about 5,000 drain plugs in fibreglass and aluminium boats, so it's "easy as pie". They recommend drilling a hole the size of the outer diameter of the drain plug, marking your three holes with the appropriate drill bit, and drilling. They also suggest using stainless hardware to bolt it and using 5200 sealant or its equivalent.
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Drilling the hole
To mark the position, place a piece of masking tape on the chosen area, aligned with the bottom of the hull. Measure up from the bottom of the hull to 1/8" for the bottom edge of the hole. This will ensure the hole is flush with the inside of the hull bottom. From this first mark, measure up half the drill bit diameter and make a second mark. Make a cross-mark perpendicular to the hull bottom, as close as possible to the centre line of the transom. This will be the centre of the hole.
When you are happy with the position, you can start drilling. Drill a hole the size of the outer diameter of the drain plug. The hole should be large enough for the plug to fit snugly. It is important to use the correct drill bit size to avoid any leaks. Once the hole is drilled, you can insert the plug and mark the three holes with the appropriate drill bit. Pull the plug out and drill these holes.
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Inserting the plug
To install a drain plug in a fibreglass boat, you will need the plug itself, a stainless steel socket head cap screw, and a flat washer. The plug should be a neoprene flanged expansion nut, which can be purchased at most hardware stores.
First, determine where to locate the drain hole. The ideal location is low on the transom, close to the bottom inside of the hull. Mark the area with masking tape, measuring up from the bottom of the hull. This will be the bottom edge of the hole. Make another mark measuring half the drill bit diameter from the first mark, and make a cross-mark perpendicular to the hull bottom, as close to the centreline of the transom as possible.
Now you are ready to insert the plug. Place the washer on the screw, and insert the screw into the large end of the plug until the threads engage. Do not tighten yet. Insert the plug into the hole until the flange is seated on the transom. Then, lightly tighten the screw with an Allen wrench. Be careful not to over-tighten, as this may crack the gel coat or rip the rubber plug.
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Sealing the plug
Firstly, it is important to select an appropriate sealant. A waterproof sealant designed for marine use is essential to ensure a durable and watertight seal. Some recommended options include using Teflon tape, applying a layer of Life Caulk, or opting for an aquarium sealant. These sealants provide a strong and flexible barrier that can withstand the aquatic environment.
When applying the sealant, focus on the treads of the fitting. Ensure that the sealant is distributed evenly and generously around the treads. Avoid applying the sealant to the plug threads themselves, as this can interfere with the functionality of the plug. A rubber gasket on the plug can further enhance the seal and prevent leaks.
In addition to sealant, consider using a mounting ring or washer. This provides an extra layer of security and helps distribute pressure evenly. Insert the screw into the large end of the plug, engaging the threads, and then lightly tighten it with an Allen wrench. Avoid over-tightening, as this can crack the gel coat or damage the plug.
For fiberglass boats, some boaters choose to thread the plug directly into the fiberglass of the hull. However, this method is controversial, with some expressing concerns about the reliability of this approach. An alternative is to drill and tap the fiberglass, creating a secure housing for the plug. This way, the plug can be easily replaced every few years without affecting the structural integrity of the hull.
Finally, once the plug is sealed and tightened, it is a good idea to test the seal. Fill the boat with water and observe the drain plug for any signs of leakage. This simple test will give you confidence in your installation and ensure that your boat remains dry and safe during use.
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Frequently asked questions
Here are the steps to install a drain plug in a fiberglass boat:
- Determine where to locate the drain hole. It is usually low on the transom, close to the bottom inside of the hull.
- Drill a hole the size of the outer diameter of the drain plug.
- Put the plug in the hole, mark the three holes with the appropriate drill bit and drill.
- Pull the plug out and drill the holes.
- Put the washer on the screw and insert the screw into the large end of the plug until the threads engage.
- Insert the plug into the hole until the flange is seated on the transom.
- Lightly tighten the screw with an Allen wrench.
The parts required for the installation are the plug itself, an 8-32 x 3/4" long Stainless Steel socket head cap screw, and a #8 S.S. flat washer.
Drain plugs are available in various materials and price ranges. A popular option is the Duckworks Nylon Flange Screw-in Drain Plug, which is inexpensive and easy to install.
Some considerations to keep in mind are the location of the drain hole, the type of sealant used, and the possibility of hitting rocks or other objects that could damage the plug.
