When plumbing marine systems below or near the waterline, material integrity is everything. Standard brass fittings suffer from dezincification in saltwater environments, making them brittle and prone to catastrophic failure. The GROCO PTH Series Adapter is purpose-built to eliminate this risk. Cast entirely from high-tensile C83600 marine bronze, this fitting delivers rugged structural strength and robust corrosion resistance that will easily outlast standard hardware.

This versatile fitting features precision-machined male NPT (National Pipe Taper) threads on one end, ensuring a tight, reliable seal when mated to valves, seacocks, or strainers. The opposite end is engineered with an elongated, deep-ridge hose barb that matches common marine hose ID standards. This extra length provides ample surface area to safely accommodate dual hose clamps, ensuring an unyielding grip that won’t back off under pressure or heavy mechanical vibration.

Key Features

• Premium C83600 Cast Bronze: Provides industrial-grade durability and excellent protection against galvanic corrosion in harsh saltwater conditions.

• Standard-Flow Performance: Optimized internal diameter ensures reliable fluid dynamics for standard marine plumbing, bilge, and engine systems.

• Extended Barbed Tail: Features deep-groove ridges that lock marine hoses firmly into place and leave plenty of room for safe dual-clamping.

• Integrated Hex Shoulder: A rugged hex nut is cast directly into the base, allowing you to easily apply secure wrench leverage during tight bilge installations.

• UL Listed 647B Safety: Manufactured to strict marine industry standards, giving you total peace of mind for mission-critical cooling loops.

Specifications