Groco Bronze Hose Barb Thru-Hull Fitting HTH-500, 1/2 Inch NPT

The Groco HTH-500 is a bronze hose barb thru-hull fitting sized for 1/2 inch hose, designed to provide a secure, corrosion-resistant through-hull connection point below the waterline. It features a 0.5 inch NPT threaded connection paired with a barb connector, allowing a hose to be clamped directly onto the fitting for a tight, leak-resistant seal. The bronze construction is well suited to continuous saltwater and freshwater exposure, making this fitting a common choice for bilge pump discharge, raw water intake, washdown, and other plumbing runs that pass through the hull.

Measuring 4 x 3 x 3 inches overall, the HTH-500 is compact enough for typical hull thicknesses while providing a solid mounting base. It is supplied as a single-piece fitting (1 unit) and is backed by a manufacturer warranty. This thru-hull fitting is intended as a below-waterline plumbing component and should be paired with an appropriate seacock or backing arrangement per standard marine plumbing practice.

Specifications

• Brand: Groco
• Manufacturer Part Number: HTH-500
• Product Name: Bronze Thru-Hull Fitting w/Nut, 1/2 Inch Hose
• Category: Thru-Hull Fittings & Strainers
• Material: Bronze
• Color/Finish: Bronze
• Connector Type: Barb
• Thread Size: 0.5 inch
• Thread Type: NPT
• Item Dimensions: 4 x 3 x 3 inches
• Number of Pieces: 1
• Weight: 0.4375 pounds

Frequently Asked Questions

What hose size does the Groco HTH-500 thru-hull fitting accept? The HTH-500 is sized for 1/2 inch hose, with a barb connector designed to accept and hold a 1/2 inch inner-diameter hose with a clamp.

What material is the Groco HTH-500 made from? This thru-hull fitting is made from bronze, a material chosen for its resistance to corrosion in both saltwater and freshwater marine environments.

What thread type and size does this fitting use? The HTH-500 uses a 0.5 inch NPT (National Pipe Thread) connection.

What are the overall dimensions of the HTH-500 thru-hull fitting? The Groco HTH-500 measures 4 x 3 x 3 inches overall.

How much does the Groco HTH-500 weigh? The HTH-500 weighs 0.4375 pounds.

Does the Groco HTH-500 come with a nut? Yes, the HTH-500 is a thru-hull fitting supplied with a nut for securing it through the hull.

What is the HTH-500 typically used for on a boat? The Groco HTH-500 bronze thru-hull fitting is commonly used for below-waterline plumbing connections such as bilge pump discharge, raw water intake, or washdown lines where a hose needs to pass through the hull.

Is the Groco HTH-500 sold as a single unit? Yes, the HTH-500 is sold as one piece (a single fitting), not as a multi-pack.

Is the Groco HTH-500 backed by a warranty? Yes, the HTH-500 is backed by a manufacturer warranty.

Is bronze a good choice for a below-waterline fitting like the HTH-500? Bronze is a standard material for below-waterline marine hardware because it resists corrosion from prolonged saltwater and freshwater exposure, which is why Groco uses it for the HTH-500 thru-hull fitting.