Seachoice 50-18651 Replacement Plug & Gasket for Mega-Flow Dripless Thru-Hull Fittings
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
The Seachoice 50-18651 is a replacement plug and gasket designed to service Seachoice Mega-Flow Dripless Thru-Hull Fittings. Replacing a worn plug or gasket restores a watertight seal and extends the service life of your thru-hull fitting without requiring a full replacement.
Parts Desk Insights
Best suited for boats where the existing Mega-Flow thru-hull fitting is in good condition but the plug or gasket has worn, cracked, or lost its seal. This is a straightforward maintenance part — if you're seeing weeping or dripping around the plug when the fitting is closed, replacing the plug and gasket is the correct first step. Compatible with the Seachoice Mega-Flow Dripless Thru-Hull Fitting range:
- Seachoice Mega-Flow Dripless Thru-Hull Fitting – 3/4" Hose (50-18601)
- Seachoice Mega-Flow Dripless Thru-Hull Fitting – 1" Hose (50-18611)
- Seachoice Mega-Flow Dripless Thru-Hull Fitting – 1-1/8" Hose (50-18621)
If you need a general-purpose screw-type drain plug replacement instead, see the Seachoice Screw-Type Drain Plug with O-Ring Seal (50-18781).
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Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.