Expanding Drain Plug (Wing Nut Style) – Ø21 mm / Ø23 mm / Ø24 mm

Code:

00914-1

A versatile expanding drain plug available in three sizes – Ø21, Ø23, and Ø24 mm. This type of plug inserts directly into the drain hole and tightens via a “butterfly” wing-head screw that expands a rubber stopper for a tight fit. It features a stainless steel screw and neoprene rubber, ensuring a secure seal and durability. Perfect as a spare or primary drain plug for a variety of watercraft.

Simple and effective design – insert the plug and tighten the wing screw in seconds, no tools needed.
Neoprene rubber body expands upon tightening, completely stopping any leaks.
Comes in Ø21, Ø23, and Ø24 mm – choose the size that matches your boat’s drain hole diameter.
Stainless steel hardware (screw/washer) – corrosion-resistant for long life in saltwater use.
Suitable for small boats, fishing boats, yachts, jet skis, etc. – easily removed and reinserted as needed.

Size: 35 mm / Ø20.5 mm 36 mm / Ø23 mm 46 mm / Ø24 mm

Price: 4⁸⁰лв. €2⁴⁵

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The “wing nut” style plug is a classic boat drainage solution that doesn’t require a permanently mounted flange. Instead, you simply insert it into the drain hole and turn the integrated winged screw. As you tighten, the bottom part – made of a tapered neoprene rubber – expands like a plug anchor and seals the hole tightly. This mechanism allows for quick insertion and removal, which is very convenient when draining water on land or in emergency situations.

Three sizes are available:

Ø21 mm: The smallest variant, suitable for holes around 20–21 mm in diameter. Often used in personal watercraft or very small boats, some canoe models, or as a plug for auxiliary drains/tanks. Recommended for boats up to ~3 m or specialized uses where the drain opening is small.
Ø23 mm: A standard size compatible with many small and medium boats (e.g., fishing dinghies, rowboats, inflatables) that have factory drain holes about 22–23 mm. This size covers most needs for boats ~3–5 m long and is an excellent general-purpose choice.
Ø24 mm: Slightly larger than standard, this variant is often employed on boats ~5–6 m or when a drain hole has widened a bit with wear. It provides a secure seal in openings roughly 24–25 mm and works well for larger bilge or deck drains.

All size options share the same high build quality. The metal screw, washer, and wing are made from stainless steel or brass with protective coating to prevent rust. The rubber section is crafted from fuel-resistant neoprene that stays elastic under temperature extremes and after prolonged use.

How to use: Ensure you have the correct plug size for your drain. Insert the plug so the rubber part is fully inside the hole. Begin tightening the wing screw by hand. You’ll feel the resistance increase – that means the rubber is expanding and sealing the hole. You don’t need to overtighten; just make sure the plug is snug and secure. To drain water, unscrew the wing a few turns – the plug will contract and you can easily pull it out. It’s always wise to keep one or two spare plugs on board, especially for longer trips – they are small but critically important for safety.

This type of plug is popular also because it allows quick response – if you notice during a voyage that a fixed drain plug is leaking, you can temporarily pop in an expanding plug until you repair the main fitting. They’re also handy for off-season storage – once your boat is on land, you can remove these plugs to keep drain holes open for ventilation and to let the bilge dry out.