Drain Plugs, Bulkheads, Kingstons, and Through-hulls

A plastic drain plug with an attached locking cap, designed for larger hull openings (Ø34 mm). This plug allows rapid and safe drainage of water, and the twist-lock cap stays tethered so it won’t get lost, ensuring a watertight closure when sealed. The durable plastic construction resists saltwater and UV degradation, making it a reliable choice for bigger boats.

• Large Ø34 mm diameter – enables faster drainage, suitable for medium and larger boats (~5–7 m length).
• Built-in screw-on cap with locking mechanism – cap remains attached to the assembly to prevent accidental loss.
• Made of impact-resistant, UV-stabilized plastic – engineered for the harsh marine environment.
• Easy transom or hull installation – includes threaded body and gaskets for a leak-proof fit.
• Secure tool-free closure – simply twist the cap by hand to seal the drain and prevent any leaks.

White plastic through-hull fittings for hoses, available in various diameters (from 15 mm to 38 mm). Used to route water through the boat’s hull – strong, lightweight, and non-corrosive, with easy installation and secure sealing via a locking nut.

• Made of UV-resistant, impact-proof plastic – will not corrode and ensures long service life
• Available sizes: Ø15, Ø18, Ø25, Ø32, Ø38 mm (to fit hoses of these inner diameters)
• Broad outer flange provides a tight fit and watertight seal against the hull
• Threaded neck with a plastic backing nut for secure inside fastening
• Versatile use – ideal for deck drains, bilge pump outlets, tank vent lines, and more

A compact Ø23 mm plastic drain plug with a locking cap, ideal for small boats and hulls with smaller drain openings. It provides reliable water drainage, with the cap staying attached to the plug assembly to prevent loss, and securely sealing the opening when twisted shut. The material is resistant to saltwater and sun exposure, ensuring longevity in marine conditions.

• Ø23 mm diameter – fits standard drain holes on small boats, RIBs, and jet skis (~3–5 m length).
• Tethered screw cap – no risk of dropping or losing the plug during drainage.
• Premium UV-resistant plastic – avoids corrosion and cracking over time in harsh weather.
• Transom or bottom installation – simple setup with gaskets for a tight fit to the hull.
• Quick hand-operated open/close – provides a leak-proof seal to prevent water ingress, no tools needed.

Flexible drain thru-hull for boats with an integrated non-return valve (one-way flap). Ø25 mm hose size, available in two length options – 120 mm and 150 mm – to suit different installation needs. Allows water to drain out automatically while preventing it from coming back in.

• Elastic tube/valve that opens under internal pressure (draining water out) and closes under external pressure (waves/backwash)
• Available in two lengths: 120 mm and 150 mm, to accommodate various transom thicknesses or desired extension beyond the hull
• White UV-resistant flexible material – withstands saltwater, sunlight, and temperature changes
• Easy installation through hull (25 mm hole) secured with a nut – the valve extends outside the hull to let water out
• Ideal for small boats, RIBs, and jet skis (3–5 m) – provides self-bailing when the boat is moving and protects against backflow when stationary

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.

A plastic thru-hull fitting with an integrated non-return flapper valve, 25 mm diameter. Allows water to drain out through the hull while automatically closing to prevent backflow. Compact design for easy hull installation with included nut.

• Built-in one-way “flap” valve – lets water out but blocks incoming flow from outside
• 25 mm hose barb – fits 25 mm (1″) hoses for bilge pumps or drains
• Wide outer flange (54 mm) ensures watertight sealing and stability on the hull surface
• Plastic material (white) – non-corrosive, saltwater-proof and UV resistant
• Ideal for drain outlets near the waterline on small boats – protects against backwash from waves or when stopping

A : 33 mm

B : 25 mm

C : 84 mm

D : 54 mm

E : 40 mm

A premium stainless steel drain plug Ø25.4 mm (1 inch) for boats, offering maximum corrosion resistance and a reliable seal. Made from polished marine-grade stainless metal, this plug assembly is designed for transom mounting with a flange and screws. A rubber gasket prevents leaks, and the robust construction withstands heavy use in saltwater.

• All AISI 316 stainless steel – resists saltwater, rust, and impact.
• Standard Ø25.4 mm (1″) opening – a commonly used size on medium and large boats.
• Includes flange base and threaded plug – easy hull installation and secure screw-in/out operation.
• Durable rubber O-ring gasket – ensures a completely watertight seal when closed.
• Ideal for powerboats, sailboats, and RIBs – especially suited for long-term water exposure and harsh marine conditions.

Durable plastic through-hull drain fitting with internal threads for a secure plug. Ideal for small craft bilge draining and transom installation, available in 27 mm, 30 mm, and 33 mm sizes.

• Sturdy UV-resistant plastic construction ensures long life in marine conditions.
• Internal thread allows use with a drain plug for watertight closure when needed (plug sold separately).
• Three size options (27, 30, 33 mm) to accommodate different boats and drainage requirements.
• Easy installation on boat transom or hull; includes locking nut for a tight, leak-free fit.
• Prevents water accumulation by enabling quick drainage of your boat when on trailer or at the ramp.

A unique automatic drain plug with neoprene flapper that self-bails your boat at speed. Designed for transom mounting, this Nautispeed valve opens on its own when you’re underway, draining water out and closing tight when stopped to block backflow.

• Automatically activates at approximately 30 km/h (planing speed) to release accumulated water.
• Neoprene flapper valve prevents backflow, keeping water from re-entering when the boat is stationary.
• No manual intervention needed – hands-free drainage for convenience and safety.
• Simple transom installation; fits standard drain tube openings for easy upgrade from a conventional plug.
• Ideal for small motorboats, RIBs, and speedboats that frequently get on plane and need quick self-bailing.

A spare white Ø23 mm drain plug for boat drainage systems – perfect for replacing a lost or worn insert. This male plug is compatible with standard plastic bases (e.g., our model code 00922) and screws in to ensure a watertight closure. It’s made of durable plastic and includes an O-ring for a tight seal.

• Compatible Ø23 mm replacement plug – fits most drain openings of this size and their bases.
• White color, premium nylon construction – UV-stable, saltwater-resistant material identical to original plugs.
• Built-in rubber O-ring – ensures waterproof performance when the plug is tightened.
• Easy to replace – simply screw the spare plug into the drain base in place of the old one, no tools needed.
• Must-have spare – every boat owner should keep at least one extra drain plug on board for emergencies.