Attwood SL30405 Gas Spring 10" Extended, 7" Compressed, 40 lbs.
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
The Attwood SL30405 gas spring is a popular replacement lift support for marine hatches and deck access ports, helping hold a lid securely in the open position.
Key Features
- Popular replacement gas spring for marine hatch applications
- 10" extended length and 7" compressed length (40 lbs output force)
- Bio-degradable, water-grade (WGK) oil for improved environmental profile
- Passes ASTM B117 salt spray testing and a 30,000-cycle lifecycle test
- Mounting brackets available separately
Intended Use
- Marine deck hatches
- Access ports and lift lids
- Boat hardware requiring a gas spring lift support
Product Details
- Manufacturer/Series: Attwood (SL series)
- Model: SL30405 (SKU: 23-SL30405)
- Type: Gas spring / lift support
- Extended length: 10"
- Compressed length: 7"
- Output force: 40 lbs
- Cycle/salt testing: ASTM B117, Attwood salt spray; 30,000-cycle lifecycle test
- Notes: Mounting brackets sold separately
Parts Desk Insights
Best Use Case: Use as a direct replacement lift support when a hatch or lid needs consistent, controlled opening/holding performance.
Common Issues: If the lid does not stay up or feels weak/overpowering, confirm the required extended/compressed lengths and output force before installation, and match the correct end fittings/mounting brackets (which are sold separately). Saltwater environments make the salt-spray lifecycle testing especially relevant—inspecting mounting surfaces and related hardware during replacement helps prevent alignment issues.
Related Products & Accessories
- Mounting brackets for Attwood gas springs (sold separately) - Browse the Attwood gas spring mounting bracket options in the related deck hatch hardware category to complete the installation.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.