White Thru Hull Plastic

Function and technical context

The thru-hull is a sealing accessory installed on the hull of the boat to allow the passage of pipes, hoses or cables through the hull without compromising the impermeability of the hull. This component works in the cooling water intake system, in bilge emptying or in any hydraulic circuit that requires controlled penetration of the hull. Made of white plastic with high resistance to marine corrosion, it is ideal for installations in salt and fresh water environments where chemical compatibility with the environment is decisive. A thru-hull in poor condition can cause uncontrolled water inflows, compromising the buoyancy of the boat and putting the safety of the crew at risk. Its dimensions (A=73 mm, B=89 mm, C=44 mm, D=38 mm, E=52 mm) determine compatibility with the thickness of the hull and the diameter of the hose or pipe to be connected, so it is essential to verify these measurements before installation.

When to replace this part?

The most common symptoms that indicate that a thru-hull needs to be replaced are: presence of persistent moisture or dripping around the accessory, visible cracks in the plastic body, deformation due to impact or aging of the material, and difficulty in adjusting or closing the associated valve if it has one incorporated. It is recommended that all thru-hulls be visually inspected at each docking or seasonal maintenance, as ultraviolet radiation and immersion cycles accelerate plastic aging. Preventively replacing a damaged thru-hull is a simple and economical intervention in the dock that avoids emergency situations due to water ingress when the boat is underway.

Compatibility table