GROCO FF-1125 Bronze Full-Flow Pipe-to-Hose Adapter, 1-1/8" Hose x 1" NPT

GROCO FF-1125 Bronze Full-Flow Pipe-to-Hose Adapter

The GROCO FF-1125 is a cast bronze, full-flow pipe-to-hose adapter designed to connect marine hose to through-hull fittings, seacocks, strainers, or any hardware with female NPT pipe threads. The full-flow (FF) design maintains an unrestricted internal passage equal to the rated pipe size, ensuring no reduction in flow capacity — critical in bilge, raw-water cooling, and exhaust systems where flow restriction causes overheating or flooding risk.

A cast-in hex nut provides a solid wrenching surface for a secure, leak-free installation. Compatible with standard marine hose and used wherever a hose tail must mate to a threaded bronze fitting.

⚠️ NOT FOR USE IN POTABLE WATER SYSTEMS.

Key Features

• Cast bronze construction — corrosion-resistant in saltwater and fresh water
• Full-flow internal bore — no restriction to rated pipe flow
• Cast-in hex nut for wrench tightening without slipping
• Female NPT pipe thread inlet (1" NPT)
• 1-1/8" hose barb outlet
• Not approved for potable (drinking) water use

Specifications

• SKU / Part Number: FF-1125
• Hose Size: 1-1/8"
• NPT Thread Size: 1"
• Material: Cast Bronze
• Weight: 132 g (approx. 0.29 lb)
• Fitting Type: Full-Flow Pipe-to-Hose Adapter

Best Use Cases

• Raw-water cooling inlet and discharge connections
• Bilge pump hose connections to bronze seacocks or through-hulls
• Engine raw-water strainer inlet plumbing
• Exhaust system water injection and discharge lines
• Livewell and washdown plumbing where full flow is required

Compatible Applications

• Connects to bronze seacocks and through-hull fittings with 1" female NPT threads
• Connects to inline raw-water strainers with 1" NPT ports
• Compatible with standard 1-1/8" ID marine reinforced hose
• Suitable for inboard and sterndrive engine cooling plumbing
• Used alongside bronze ball valves, gate valves, and seacocks in below-waterline installations

Available Sizes — GROCO FF Series

This fitting is available in multiple hose sizes. Select the size that matches your hose ID and NPT thread:

• FF-500 — 1/2" Hose x 1/2" NPT
• FF-750 — 3/4" Hose x 3/4" NPT
• FF-1000 — 1" Hose x 1" NPT
• FF-1125 — 1-1/8" Hose x 1" NPT (this product)
• FF-1250 — 1-1/4" Hose x 1-1/4" NPT
• FF-1500 — 1-1/2" Hose x 1-1/2" NPT

Parts Desk Insights

Best Use Case: The FF-1125 is the go-to adapter when plumbing a 1-1/8" hose to a 1" NPT-threaded bronze fitting — most commonly seen on inboard raw-water cooling circuits and bilge discharge lines where a full, unobstructed bore is required for system performance. The full-flow designation means internal passage is not necked down, which is critical in cooling systems where even minor restriction accelerates impeller wear and risks overheating.

Confirm your hose ID before ordering — the 1-1/8" barb is sized for nominal 1-1/8" ID hose and will not seal correctly on 1" hose. For 1" hose with 1" NPT hardware, use the FF-1000 instead.