Sea-Dog Locking Diesel Hose Deck Fill, 1-1/2 Inch Hose, 316 Stainless Steel, Part 351321-1

The Sea-Dog 351321-1 is a locking hose-style deck fill built for diesel fuel systems using 1-1/2 inch fill hose. Its locking cap is designed to prevent fuel theft: the cap spins freely while in the locked position, and to unlock it the owner turns the included key until the keyhole lines up with the cap tabs. Two keys are supplied along with a cap attachment cable, so the cap stays tethered to the boat and cannot be misplaced during fueling.

The fitting is investment cast from 316 stainless steel, a corrosion-resistant alloy suited to long-term saltwater exposure, giving the deck fill durability well beyond stamped or plated fittings. The cap measures 2-1/8 inches in diameter and threads onto a 11-1/2 NPSM straight thread pitch. The body is marked "Diesel" and color-coded per the international deck fill identification system, so crew and fuel dock staff can confirm the correct fuel type at a glance and avoid a costly misfueling.

Installation is straightforward: the deck fill mounts with three #10 flathead fasteners (fasteners not included), and it accepts standard 1-1/2 inch fill hose. Because a deck fill sits in an open fuel-vapor path, USCG regulations require a bonding wire be connected to the fitting to prevent sparking; installers should wire the bonding connection as part of the install. This deck fill is sold individually.

Specifications

• Brand: Sea-Dog
• Manufacturer Part Number: 351321-1
• Body Marking: Diesel
• Hose Size: 1-1/2 inch
• Cap Diameter: 2-1/8 inch
• Thread Pitch: 11-1/2 NPSM straight
• Cap Type: Locking, spins freely when locked
• Included Keys: 2
• Cap Attachment Cable: Included
• Fastener Type: #10 FH (flathead), 3 required, not included
• Material: Investment cast 316 stainless steel
• Weight: 0.966 pounds
• Standard Pack: 1 each
• Bonding: USCG-required bonding wire connection to prevent sparking

Frequently Asked Questions

What fuel type is the Sea-Dog 351321-1 deck fill designed for? The 351321-1 is marked and color-coded for Diesel fuel, so it should be installed on the diesel fill line rather than a gasoline or water fill.

What size hose does this deck fill accept? It is built for 1-1/2 inch fill hose; a separate 2 inch hose version of this locking diesel deck fill is available as a different part number if a larger hose is needed.

How does the locking cap work? The cap on part 351321-1 spins freely while locked so it cannot be forced open; to unlock it, turn the supplied key until the keyhole lines up with the cap tabs, then the cap can be removed.

How many keys come with the deck fill? Two keys are included with the Sea-Dog 351321-1 locking deck fill, along with a cap attachment cable to keep the cap tethered to the boat.

What material is the 351321-1 deck fill made from? It is investment cast from 316 stainless steel, a corrosion-resistant grade chosen for long-term durability in a marine saltwater environment.

What size are the mounting fasteners? The deck fill installs with three #10 flathead fasteners; the fasteners themselves are not included with part 351321-1.

What is the cap diameter and thread pitch on this deck fill? The cap measures 2-1/8 inches in diameter and uses an 11-1/2 NPSM straight thread pitch.

Is a bonding wire required for installation? Yes, USCG regulations require a bonding wire be connected to the 351321-1 deck fill to prevent sparking around fuel vapors.

How much does this deck fill weigh? The Sea-Dog 351321-1 diesel hose deck fill weighs 0.966 pounds.

Does the deck fill come with a non-locking cap option? The 351321-1 is the locking-cap version; Sea-Dog also offers a replacement non-locking cap (part 351391-1) as a separate accessory for this deck fill line.

Is this deck fill sold as a single unit? Yes, the 351321-1 is packaged and sold as a standard pack of 1 each.