Attwood 3874-3 Polypropylene Thru-Hull Connector Fitting, White, Fits 1-1/8 to 1-1/4 Inch ID Hose

The Attwood 3874-3 is a polypropylene thru-hull connector fitting used to route a hose through a boat hull wall while maintaining a secure, water-resistant seal at the penetration point. It is built for below-waterline and above-waterline plumbing runs such as bailers, livewells, washdowns, and drain lines where a hose must pass cleanly through the hull. The fitting is molded from polypropylene for corrosion resistance in a marine environment and finished in white to blend with typical hull and deck gelcoat colors.

This connector accepts hose with an inside diameter of 1-1/8 inch to 1-1/4 inch and has a stem length of 3-1/4 inch, making it suitable for hull sections up to 1-1/4 inch in maximum thickness. Installation requires a 1-3/8 inch hole drilled through the hull. The one-piece design allows the hose to be clamped directly to the stem on the interior side while the fitting body seats against the exterior hull surface, giving installers a straightforward through-hull hose connection without additional adapters.

Specifications

• Brand: Attwood
• Manufacturer Part Number: 3874-3
• Material: Polypropylene
• Color: White
• Hose Inside Diameter: 1-1/8 inch to 1-1/4 inch
• Stem Length: 3-1/4 inch
• Maximum Hull Thickness: 1-1/4 inch
• Installation Hole Diameter: 1-3/8 inch
• Weight: 0.2683 pounds

Frequently Asked Questions

What size hose does the Attwood 3874-3 thru-hull fitting accept? The 3874-3 accepts hose with an inside diameter of 1-1/8 inch to 1-1/4 inch.

What diameter hole do I need to drill in the hull to install this fitting? Installing the Attwood 3874-3 requires a 1-3/8 inch installation hole through the hull.

How thick a hull can the 3874-3 fitting be used on? This fitting is rated for hulls up to 1-1/4 inch in maximum thickness.

What is the stem length of the Attwood 3874-3? The stem length is 3-1/4 inch, measured from the fitting body to the end of the hose barb.

What material is the Attwood 3874-3 thru-hull fitting made from? It is made from polypropylene, a corrosion-resistant plastic suited to marine hull fittings.

What color is the 3874-3 fitting? The 3874-3 has a white finish.

Can the 3874-3 be used for a bailer or livewell drain line? Yes, it functions as a general-purpose thru-hull hose connector suitable for bailer, livewell, washdown, or drain hose runs that pass through the hull.

How much does the Attwood 3874-3 weigh? The Attwood 3874-3 weighs 0.2683 pounds.

Does the 3874-3 come with a hose clamp? The fitting itself is the thru-hull connector body; a separate hose clamp is used on the interior side to secure the hose to the stem.

How does the 3874-3 differ from the Attwood 3874-1? The 3874-3 and 3874-1 are both white polypropylene thru-hull connectors in the same 3874 series but are separate part numbers, so the correct one should be selected by part number to match the required hose and hull dimensions.