Description
Product Overview
A professional-grade installation tool for flaring brass and aluminum transom drain tubes on boats. Designed for marine technicians and serious DIY boat owners, this tool creates clean, leak-free flares in 1-inch drain tubes — ensuring a watertight seal that prevents transom rot and hull damage.
Machined from hardened steel with a corrosion-resistant finish, this flaring tool creates a uniform, professional flare every time. Whether you're replacing a corroded drain tube or building a new transom, the right tool makes the difference between a leak-prone installation and a lifetime seal.
Key Features
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Professional-Grade Flaring: Creates a smooth, uniform flare on 1-inch brass or aluminum drain tubes with consistent, even pressure.
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Hardened Steel Construction: Heat-treated tool steel withstands repeated use without deformation or wear.
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Corrosion-Resistant Finish: Protective coating prevents rust in marine environments.
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Ergonomic Design: Comfortable handle provides the leverage needed for controlled, even flaring without damaging the tube or transom.
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Versatile Material Support: Works with both brass (standard marine) and aluminum drain tubes.
Compatibility
| Application |
Tube Size |
Material |
| Boat Transom Drain |
1" OD Drain Tube |
Brass / Aluminum |
| Livewell Drain |
1" OD Tube |
Brass / Aluminum |
| Bilge Outlet |
1" OD Tube |
Brass |
Designed for 1-inch outside diameter metal tubes. Not compatible with plastic drain tubes.
Technical Specifications
| Specification |
Detail |
| Tool Type |
Transom Drain Tube Flaring Tool |
| Tube Size |
1" OD (Outside Diameter) |
| Compatible Materials |
Brass, Aluminum |
| Tool Material |
Hardened Tool Steel |
| Warranty |
1-Year Limited Warranty |
Why Use a Proper Flaring Tool?
A poorly installed transom drain tube is one of the most common sources of catastrophic transom rot. Hammer-flaring or makeshift methods create uneven seals that allow water to wick into the transom core — leading to wood rot, delamination, and repair bills in the thousands. This professional flaring tool applies even, controlled pressure to create a factory-quality flare.
Frequently Asked Questions
Q: Does this tool work on aluminum drain tubes?
A: Yes — this flaring tool works with both brass and aluminum 1-inch drain tubes. Aluminum requires slightly less force than brass.
Q: How do I use a transom drain tube flaring tool?
A: Insert the drain tube through the transom hole with the flange seated against the exterior. Slide the flaring tool into the tube from inside the boat. Tighten the tool's threaded shaft to expand the inner end of the tube, creating a flare that compresses against the inner transom surface. Apply marine sealant (3M 4200 or 5200) on both flanges before final tightening.
Q: Can I use this on plastic drain tubes?
A: No — this tool is designed for metal tubes (brass and aluminum). Plastic drain tubes typically use threaded compression fittings rather than flaring.
Q: What sealant should I use with the drain tube?
A: Use a marine-grade polyurethane sealant like 3M 4200 (removable) or 3M 5200 (permanent). Apply a continuous bead around both the exterior flange and the interior flare before final compression. Never use silicone.
Q: How tight should the flare be?
A: Tighten until the inner flare is fully formed and compresses firmly against the transom with sealant visible squeezing out around the edges. The flare should be uniform and approximately 1/8" wider than the tube diameter.
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