Sea-Dog Red Clam Shell Deck Fill Replacement Cap – 1-1/4" NPSM (357090)
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
The Sea-Dog 357090 Red Clam Shell Deck Fill Replacement Cap is a color-coded replacement cap for compatible Sea-Dog clam shell deck fill fittings. The red cap designates the gasoline fill point — an important safety convention on multi-fill boats to prevent misfuelling. The 1-1/4" x 11-1/2 NPSM straight thread provides a secure, water-tight closure at the deck fill.
Key Features
- Red color coding — designates gasoline fill point per marine safety convention
- Clam shell style cap
- Thread: 1-1/4" x 11-1/2 NPSM straight
- Replacement cap for compatible Sea-Dog clam shell deck fill fittings
- SKU: 354-3570901
Best Use Case
Use this cap to replace a missing or damaged cap on a compatible Sea-Dog clam shell deck fill fitting. On boats with multiple deck fills, maintaining correct color-coded caps is a safety requirement — red for gasoline prevents accidental misfuelling into water or waste tanks. Replace promptly if lost to keep water and debris out of the fill hose.
Parts Desk Insights
This is a clam shell style, gas (red) cap only — confirm your fill body uses the clam shell profile and 1-1/4" x 11-1/2 NPSM straight thread before ordering. For the 357010 series color-coded caps (different fill body style), see the Sea-Dog Red Gas Deck Fill Cap (357015), Sea-Dog Green Diesel Deck Fill Cap (357016), and Sea-Dog Black Waste Deck Fill Cap (357018). For a complete deck fill assembly, see the Sea-Dog 3570301 Gas Deck Fill with Keyless Cap.
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.