Groco Stainless Steel Thru Hull Fitting HTH-750-S, 3/4 Inch NPS Thread with Locknut

The Groco HTH-750-S is a stainless steel thru hull fitting sized for 3/4 inch hose connections, designed for below-waterline plumbing runs on boats such as raw water intake, drain, and discharge lines. The fitting uses a 3/4 inch National Pipe Straight (NPS) thread with a right-hand, coarse thread class, allowing it to mate with standard 3/4 inch hose barb and strainer fittings common on recreational and commercial vessels. It ships with a locknut that includes a bonding screw, letting installers tie the fitting into a boat's bonding system for corrosion protection and electrical continuity between underwater metal fittings. The compatible groove diameter is 0.75 inches, and the fastener uses a flat head with a slotted drive for straightforward installation with a standard screwdriver. Overall installed dimensions are 4 x 3 x 3 inches, and the fitting carries a commercial grade rating, reflecting construction suited to demanding marine service. At 0.5125 pounds, it is light enough for straightforward handling during hull installation or replacement. This thru hull fitting is a straightforward, single-piece replacement part for boat owners upgrading or replacing an existing 3/4 inch thru hull connection.

Specifications

• Brand: Groco
• Manufacturer Part Number: HTH-750-S
• Thread Size: 3/4 inch
• Thread Type: National Pipe Straight (NPS)
• Thread Style: Right Hand
• Thread Class: Coarse
• Compatible Groove Diameter: 0.75 inches
• Exterior Finish: Stainless Steel
• Screw Head Style: Flat
• Drive Style: Slotted
• Grade Rating: Commercial
• Item Dimensions: 4 x 3 x 3 inches
• Weight: 0.5125 pounds
• Included Hardware: Locknut with bonding screw
• Number of Pieces: 1

Frequently Asked Questions

What size hose does the Groco HTH-750-S fit? The Groco HTH-750-S is sized for 3/4 inch hose, with a compatible groove diameter of 0.75 inches for a secure hose connection.

Does this thru hull fitting come with a locknut? Yes, the HTH-750-S includes a locknut with a bonding screw, allowing the fitting to be tied into a boat's bonding system during installation.

What thread type does the HTH-750-S use? It uses a 3/4 inch National Pipe Straight (NPS) thread with a right-hand, coarse thread class.

Is the Groco HTH-750-S made of stainless steel? Yes, this Groco thru hull fitting has a stainless steel exterior finish, suited for below-waterline marine use.

What are the overall dimensions of this fitting? The HTH-750-S measures 4 x 3 x 3 inches as installed.

How much does the HTH-750-S weigh? This thru hull fitting weighs 0.5125 pounds.

What is a bonding screw used for on this fitting? The bonding screw on the HTH-750-S locknut lets installers connect the fitting to the boat's bonding wire, providing corrosion protection and electrical continuity between underwater metal fittings.

What type of screw head and drive does the HTH-750-S use? The fitting uses a flat head screw with a slotted drive, installable with a standard flathead screwdriver.

Is the HTH-750-S rated for commercial use? Yes, the Groco HTH-750-S carries a commercial grade rating.

How many pieces come with the HTH-750-S? The HTH-750-S is supplied as a single-piece thru hull fitting with its locknut and bonding screw included.

What is the HTH-750-S typically used for on a boat? This 3/4 inch thru hull fitting is used for below-waterline plumbing connections such as raw water intake, drain, or discharge lines.