Marine Transom Drain Plug with 1-inch Rubber O-Ring

Marine Transom Drain Plug with 1-inch Rubber O-Ring – Fits Various Boats

This screw-type transom drain plug is engineered to fit a standard 1-inch diameter drain hole on a wide range of boat hulls. It provides a secure, reliable seal to prevent water intrusion when on the water and allows for easy draining when out of the water.

It serves as a direct, reliable aftermarket replacement for T-H Marine DP-1-DP, YOIASUGH/YOIASHGH, CoKoou, and BoBiFive transom drain plugs.

• Installation Type: Screw-in with O-ring seal
• Compatibility: Fits 1-inch (25.4 mm) drain holes
• Material: Constructed from durable, corrosion-proof Marine Grade Nylon PA66

Compatible Boat Types

Confirm your boat type in the table below.

Technical Specifications

Package Contents

• 1 x Marine Transom Drain Plug with 1-inch Rubber O-Ring

Installation Guide

1. Ensure the boat is safely out of the water before installation.
2. Clean the transom drain hole and surrounding area, removing any old sealant or debris.
3. Inspect the new plug’s rubber O-ring to confirm it is properly seated and free of defects.
4. Insert the drain plug into the 1-inch drain hole.
5. Turn the plug clockwise by hand until it is snug. The O-ring will compress to create a watertight seal.
6. Do not overtighten, as this can damage the plug or the hull threads.

Troubleshooting & FAQ

Q: How do I know if this plug will fit my boat?
A: This drain plug is specifically designed for a standard 1-inch diameter drain hole. The most reliable method is to measure your boat's drain hole to confirm the size before purchasing.

Q: Why does my plug leak?
A: Leaks are typically caused by an incorrect fit, a damaged or worn O-ring, or debris around the seal. Ensure the drain hole is exactly 1-inch, the area is clean, and the O-ring is in good condition. Overtightening can also cause damage that leads to leaks.

Q: Is this plastic plug as good as a brass one?
A: Yes. This plug is manufactured from high-strength, marine-grade Nylon PA66 plastic, which is designed to resist corrosion, chemicals, and UV degradation in a marine environment, offering excellent durability and a long service life.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.