Sea-Dog 351390-1 Replacement Cap for 1-1/2 Inch Angled Hose Deck Fills 351520-351523

The Sea-Dog 351390-1 is a genuine replacement cap for Sea-Dog's 1-1/2 inch angled hose deck fills, part numbers 351520-351523. If the original cap on a gas or diesel deck fill is lost, damaged, or worn out, this cap restores the fitting to like-new function without replacing the entire deck fill assembly.

The cap uses a slotted design that requires a deck fill key to open and close, adding a layer of security against tampering or unauthorized access to the fuel or water fill. It is constructed of investment cast 316 stainless steel for corrosion resistance in a marine environment, matching the material used across the deck fill line it belongs to. The cap measures 1-7/8 inches in diameter with an 11-1/2 NPSM straight thread pitch, matching the threads on the 351520-351523 deck fill bodies.

An attachment cable (0P35105) is included with the cap so it stays tethered to the deck fill and cannot be dropped or lost overboard during use. A flange gasket for 1-1/2 inch deck fills (351349) is sold separately and is not included with this cap. The 351390-1 weighs 0.22 pounds.

Specifications

• Brand: Sea-Dog
• Manufacturer Part Number: 351390-1
• Fits Deck Fill Models: 351520-351523
• Material: Investment cast 316 stainless steel
• Cap Diameter: 1-7/8 inches
• Thread Pitch: 11-1/2 NPSM straight
• Attachment Cable: Included (0P35105)
• Gasket: Sold separately (351349)
• Weight: 0.22 pounds
• UPC: 035514351010

Fitment

• Sea-Dog 1-1/2 inch angled hose deck fills, part numbers 351520-351523

Replaces (OEM)

• No cross-reference numbers listed

Frequently Asked Questions

What deck fills does the Sea-Dog 351390-1 cap fit? The 351390-1 is a replacement cap for Sea-Dog's 1-1/2 inch angled hose deck fills, part numbers 351520-351523.

Do I need a key to open this deck fill cap? Yes, the 351390-1 uses a slotted cap design that requires a deck fill key to open and close, which adds security against unauthorized access.

What is the 351390-1 cap made of? It is constructed of investment cast 316 stainless steel, matching the material used across Sea-Dog's angled hose deck fill line.

What size and thread does the cap use? The 351390-1 cap has a diameter of 1-7/8 inches with an 11-1/2 NPSM straight thread pitch, matching the 351520-351523 deck fill bodies.

Does the replacement cap come with an attachment cable? Yes, the 351390-1 includes attachment cable 0P35105 so the cap stays tethered to the deck fill and cannot be dropped or lost.

Is the gasket included with the 351390-1 cap? No, the flange gasket for 1-1/2 inch deck fills (part number 351349) is sold separately and is not included with the 351390-1 cap.

How much does the 351390-1 replacement cap weigh? The Sea-Dog 351390-1 cap weighs 0.22 pounds.

What is the difference between the 351390-1 and 351391-1 caps? The 351390-1 is a replacement cap for the 1-1/2 inch deck fills (351520-351523), while the 351391-1 is a replacement cap for the 2 inch deck fills (351620-351621).

Will the 351390-1 cap fit both gas and diesel deck fills? The 351390-1 fits the 1-1/2 inch deck fill bodies (351520-351523) regardless of the fuel type marking on the fill, since it is sized to the 1-7/8 inch cap diameter and 11-1/2 NPSM thread shared by that series.

Does this cap need a bonding wire? USCG regulations require a bonding wire on deck fill installations to prevent sparking; this applies to the deck fill assembly the 351390-1 cap is installed on.

Is the 351390-1 cap sold with the deck fill hardware or fasteners? No, the 351390-1 is the replacement cap only; the deck fill assembly installs with three #10 flat head fasteners, which are not included with the cap.