SEAFLO Thru Hull Fitting Marine Drain Overflow Connector - Corrosion

In this review the SEAFLO Thru Hull Fitting is assessed as a practical, corrosion-resistant option for above-waterline drainage on small craft. It is aimed at boat owners, DIY marine plumbers and RV users who need a reliable overflow or bilge port that resists saltwater and UV exposure. The single biggest reason to buy is its durable injection-molded polypropylene construction that eliminates metal corrosion risk while providing a simple, secure installation for non-submerged plumbing applications.

Key Features

• Marine-grade polypropylene: Durable injection-molded material resists UV, saltwater, oil and fuel for long-term service in harsh marine environments.
• Designed for overflow and bilge use: Intended for overflow drains, bilge outlets and livewell plumbing where above-waterline sealing is required.
• Secure mounting flange and threads: Broad flange and precision-molded threads make installation straightforward and provide a vibration-resistant seal without special adhesives.
• ABYC compliance: Meets ABYC safety guidelines for small craft fittings, making it suitable for non-submerged boat plumbing where compliance matters.
• Multiple-pack option: Available in a 10-pack configuration so users can equip multiple boats or keep spares for routine maintenance.

Who It's For

The SEAFLO fitting is best for boat owners, anglers and small-craft DIYers who need a corrosion-free port for overflow drains, bilge outlets or livewell systems where the fitting remains above the waterline. It suits installers who value easy, dependable installation using standard marine tools and who prefer plastic over metal in saltwater environments.

Those who require a submerged thru-hull solution or who need exact size assurance should be cautious; several customers report receiving the wrong size, so double-checking dimensions or ordering a single unit first may be prudent for custom installations.

Pros & Cons

Pros

• Resists corrosion and UV degradation, delivering strong long-term durability in saltwater conditions.
• Easy to install with a broad mounting flange and precision threads for a secure seal.
• Complies with ABYC standards for small craft fittings, adding a layer of safety assurance.
• Good value when buying a 10-pack for multiple fittings or spares.

Cons

• Size confusion reported by customers means careful measurement and verification are required before purchase.
• Made for above-waterline use only, so not suitable for submerged thru-hull applications.

Specifications

Model	SFDS1-1125-01-10
Size	118
Height	94.0 mm
Material	Polypropylene
Weight	0.065 kg (per piece)
Pack Quantity	10-Pack

Our Verdict

The SEAFLO Thru Hull Fitting is a smart, cost-effective choice for users who need a reliable above-waterline drain or bilge port that will not corrode. Its polypropylene construction, ABYC compliance and easy installation make it good value for small craft and RV plumbing projects, provided the buyer confirms the required dimensions to avoid sizing issues.

Frequently Asked Questions

Is this fitting suitable for submerged thru-hull use?
This fitting is intended for above-waterline plumbing such as overflow drains and bilge outlets and is not designed for submerged thru-hull applications.

What material is the fitting made from?
The fitting is injection-molded polypropylene, chosen for resistance to UV, saltwater, oil and fuel and to eliminate metal corrosion risk.

Does it meet industry safety standards?
Yes, the product meets ABYC guidelines for small craft fittings and is appropriate for non-submerged boat plumbing where compliance is required.