Straight Hose Thru-Hull Fittings

Groco's HTH-*-S series of straight hose thru-hull fittings are designed to provide secure and efficient connections for various boat systems. These high-quality fittings are crafted from #316 stainless steel, offering superior corrosion resistance and durability in challenging marine environments.

The HTH-*-S series boasts several notable features:

• NPS Thread With Hose Connection: Ensures a secure and standardized fit
• #316 Stainless Steel Construction: Provides excellent corrosion resistance
• Size Range: Available in sizes from 3/4" to 2" barb
• UL Listed 647B: Meets safety standards for marine use
• Has locknut with bonding screw

Each size is designed with specific dimensions to ensure proper fit and function in various boat designs and applications.

Installation and Best Practices

When installing Groco HTH-*-S thru-hull fittings, consider the following guidelines:
1. Choose the appropriate size based on your hose I.D. and hull thickness. 2. Use a backing block for added support and to prevent the fitting from turning. 3. Ensure proper sealing by using marine-grade sealant around the flange. 4. Tighten securely but leave some room to tighten more later. Once the sealant has cured, tighten a little bit more but avoid over-tightening, which may damage the fitting or hull.

Applications

Groco HTH-*-S fittings are versatile and can be used in various marine systems, including:

• Bilge pump outlets
• Sink and shower drains
• Engine cooling water intakes
• Air conditioning discharge lines

These fittings are designed for above and below waterline use, making them suitable for a wide range of boating applications[6].

Frequently Asked Questions

What is the difference between NPS and NPT threads?
NPS (National Pipe Straight) threads are straight and parallel, while NPT (National Pipe Taper) threads are tapered. Groco HTH-*-S fittings use NPS threads for a more secure fit in marine applications.

How often should I inspect my thru-hull fittings?
It's recommended to inspect thru-hull fittings at least annually or before extended voyages. Look for signs of corrosion, loose fittings, or deterioration of surrounding sealant.

Can I use Groco thru-hull fittings with other brands of seacocks?
While Groco fittings are designed to work best with Groco seacocks, they may be compatible with other brands that use standard NPS threads. Always verify compatibility before installation.