Sierra Hose Barb 5/16 Inch Barb x 3/8 Inch NPT Male, 18-8109

The Sierra 18-8109 is a hose barb fitting built to connect marine hose to a 3/8 inch male NPT threaded port. One end of the fitting is a 5/16 inch barb designed to grip hose securely under vibration and pressure, while the opposite end threads directly into a fitting or component using standard 3/8 inch NPT male threads. It is manufactured with a machined finish for a consistent, leak-resistant seal at both the hose connection and the threaded joint.

This fitting is used wherever a boat's plumbing, fuel, or cooling system needs to transition from hose to a threaded NPT port, and it is sized to work with 5/16 inch inside diameter hose. Sierra engineers its parts to meet or exceed the performance of the original equipment they replace, and the company supplies OEM engine manufacturers and boat builders with parts on a daily basis, so the 18-8109 is built to the same demands as factory-installed hardware. Its compact dimensions and single-piece construction make it a straightforward, drop-in solution for hose-to-threaded-port connections in the engine compartment or fuel and cooling lines.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8109
• Barb Size: 5/16 inch
• Thread Size: 3/8 inch NPT
• Connection Type: Male
• Thread Type: NPT
• Connector Type: Barb
• Exterior Finish: Machined
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 0.07 pounds
• Unit Count: 1

Fitment

Universal hose barb fitting sized for 5/16 inch hose and 3/8 inch NPT male threaded ports; not restricted to a specific engine or model.

Frequently Asked Questions

What size hose does the Sierra 18-8109 fit? The Sierra 18-8109 has a 5/16 inch barb end, so it is sized for hose with a 5/16 inch inside diameter.

What thread does the other end of the 18-8109 use? The opposite end of the 18-8109 is a 3/8 inch male NPT thread, allowing it to screw directly into a threaded port or fitting.

Is the 18-8109 a straight fitting or an elbow? The 18-8109 is a straight hose barb, transitioning in a single line from the 5/16 inch barb to the 3/8 inch NPT male thread.

What is the 18-8109 made from and how is it finished? The 18-8109 has a machined exterior finish, giving it precise, consistent threads and a tight seal at both connection points.

How much does the Sierra 18-8109 weigh? The 18-8109 weighs 0.07 pounds.

What are the dimensions of the 18-8109 hose barb? The Sierra 18-8109 measures 0.39 x 0.39 x 0.39 inches.

Does the 18-8109 come with any other hardware? The 18-8109 ships as a single hose barb fitting with no additional hardware included.

Will the 18-8109 fit any boat with a 3/8 inch NPT port? Yes, the 18-8109 is a universal fitting sized to any 3/8 inch NPT male threaded port paired with 5/16 inch hose, rather than being limited to one specific engine or model.

Is Sierra's 18-8109 built to OEM standards? Sierra engineers the 18-8109 to meet or exceed the performance of the original equipment part it replaces, using the same quality standards Sierra supplies to OEM engine manufacturers and boat builders.

Can the 18-8109 be used on fuel lines as well as cooling lines? The 18-8109 hose barb is a general-purpose fitting for connecting 5/16 inch hose to a 3/8 inch NPT male port, suitable wherever that hose-to-thread transition is needed on a boat.

How many 18-8109 fittings come in a package? The Sierra 18-8109 is sold as a single unit, one hose barb per package.