Perko 0322 Pipe Thru-Hull Connection, Cast Bronze, NPT/S, 5pk

Overview

The Perko 0322 is a cast bronze thru-hull connection for use with pipe on boat hulls. This dealer-pack range covers 3/8 in through 1-1/2 in NPT/S pipe sizes, with mounting hole diameters from 11/16 in to 1-7/8 in and maximum hull thickness ratings from 1-3/8 in to 2-1/4 in depending on the selected size.

The fitting is made for below-waterline style plumbing work where the pipe size, hull thickness, and drilled opening all need to match before installation. The flange is machined to sit against the hull and includes a groove to help hold bedding compound, while the neck is threaded to approximately 3/8 in from the flange.

This is a practical choice for boatyards, service departments, and owners maintaining raw-water, drain, or other marine pipe runs where a bronze thru-hull connection is required and the exact size must match the existing system layout.

Key features

• Cast bronze construction for marine plumbing installations where bronze hardware is required.
• Machined flange sits against the hull and includes a groove that helps retain bedding compound during installation.
• Threaded neck reaches to approximately 3/8 in from the flange for pipe connection setup.
• Dealer package contains 5 pieces of the selected size, useful for refits, yard inventory, or multi-fitting service work.
• Size range in this parent listing covers 3/8 in, 1/2 in, 3/4 in, 1 in, 1-1/4 in, and 1-1/2 in pipe connections.
• Each configuration pairs its pipe size with a specific mounting hole diameter and maximum hull thickness rating to support proper fit checks before drilling or replacement.

Variants

This product is offered in multiple dealer-pack configurations. The main differences across the range are pipe size, mounting hole diameter, maximum hull thickness, and flange outside diameter.

The cast bronze construction, machined bedding-compound groove, threaded neck format, and 5-piece dealer package remain common across these configurations. Match the selected size to the vessel’s pipe run and confirm hull thickness before installation.

Installation and fit

Before installation, compare the pipe size and mounting hole diameter with the existing hull opening or the planned drill size. The maximum hull thickness rating is especially important on thicker solid-glass hulls, reinforced sections, cored construction, and areas with interior backing or fairing.

Use bedding compound appropriate for the hull material and the service location. The groove in the flange helps keep compound in place as the fitting is seated, but the surrounding hull surface still needs to be clean, dry, and properly prepared for a sound seal.

Use on board

This thru-hull connection is most relevant for boats using pipe-threaded plumbing arrangements rather than hose-only fittings. It fits service work on fishing boats, cruisers, sailboats, and workboats where bronze thru-hull hardware is part of the existing system design.

Because this is a hull penetration, it should be installed with the correct backing, sealing method, and compatible downstream components. Final suitability depends on the complete plumbing layout, not only the thru-hull fitting size.

Maintenance and care

Inspect the fitting during haul-outs for corrosion, movement, damaged threads, bedding failure, or signs of leakage around the flange. Any change around a thru-hull should be handled before the boat returns to service.

What’s included

• 5 thru-hull connections in the selected pipe size