GROCO PTH Series Pipe-to-Hose Adapter

The GROCO PTH Series Pipe-to-Hose Adapter provides a secure, marine-grade transition between NPT threaded pipe and flexible hose. Ideal for marine plumbing and engine systems, the PTH adapters deliver a leak-resistant hose barb connection with standard flow and robust corrosion resistance.

Key Features

• Material Options: Available in C83600 bronze (not intended for potable water) and 316 stainless steel (NSF‑61 compliant for potable applications).
• Connection Type: Male NPT to hose barb; sizes available from 1/2" to 5" to match common NPT threads and hose ID standards.
• Marine-Grade Construction: Designed for marine plumbing, cooling pumps and engine system applications; standard-flow design and UL listing where noted.
• Compact Packaging: 2" bronze variant ships in a compact box (~4" L x 3" W x 3" H; ~0.85 lb); smaller sizes ship in proportionally smaller packaging.

GROCO PTH adapters make hose-to-pipe transitions quick to install and reliable under vibration and saltwater exposure. Choose bronze for typical marine fittings where potable water compatibility is not required, or select 316 stainless for potable systems and highly corrosive environments. These adapters are compatible with common marine hoses, NPT-threaded fittings, GROCO valves and pumps, and are suitable for cooling, bilge and many engine-system plumbing applications.

Specifications vary by model—see variant details for exact material, NSF compliance, packaged dimensions and weight. Contact GROCO or your marine supplier for compatibility with specific hoses or systems.