[Function] This marine expansion drain plug designed for 25mm hole will keep your boat dry.
[Application] Suitable for exterior gutters, sump drains, bilge pump drains, can be used to seal off fish tanks and bait tanks.
[Material] Made of stainless steel and rubber material, it is durable and corrosion-resistant in marine environments.
[Easy to install] No other tools required, by turning the T-shaped knob, the rubber plug expands and seals tightly in the hole, preventing water leakage.
[Safety sealing] Even under the action of the boat's vibration and continuous oscillation, the waterproof plug does not allow liquid to pass through.