Engine Room Parts
Hoses, Clamps & Couplings
Flexible fuel, exhaust, hydraulic, and coolant hose systems with marine-grade fittings
Request QuoteReliable Flexible Connections for Marine Systems
Flexible hoses provide critical connections between rigid piping, engines, and equipment where vibration and movement require elasticity. Mercer Yachting supplies SAE-specification hoses for fuel, exhaust, hydraulic fluid, and coolant applications, paired with stainless clamps, ferrules, quick couplers, and camlocks rated for marine service. Proper hose selection prevents leaks, system failures, and ensures regulatory compliance on superyachts, cruise ships, and commercial vessels.
What We Supply
Fuel Hoses
SAE J30R7/SAE J30R9 diesel fuel hoses with stainless fittings for main and auxiliary engines
Exhaust Hoses
High-temperature silicone and elastomer exhaust ducting with reinforced construction
Hydraulic Hoses
SAE J517 high-pressure hoses for deck machinery, steering, and propulsion systems
Coolant Hoses
Fresh water and seawater cooling system hoses with marine-grade materials
Stainless Clamps
316L stainless hose clamps and worm-drive clamps in multiple sizes
Quick Couplers & Camlocks
Flat-face and poppet-style quick disconnect couplings for rapid connections
Ferrules & Adapters
Hose ends, JIC adapters, NPT fittings, and compression couplings
Hose Assemblies
Pre-assembled and pressure-tested hose systems with OEM-matched specs
How to Specify
Provide These Details
- Hose ID (inner diameter) and OD (outer diameter) or dash size
- Hose type and service (fuel, exhaust, hydraulic, cooling water)
- Working pressure rating and temperature range
- Minimum bend radius requirement
- Length and end connection types (JIC, NPT, compression, clamps)
- Material compatibility (fuel system, seawater, coolant chemistry)
Common RFQs We Handle
Fuel Hose SAE J30R7
5/16" and 3/8" diesel fuel line with stainless JIC adapters
High-Temperature Exhaust Hose
Silicone turbo exhaust ducting rated to 150-200 degrees Celsius
Hydraulic Hose EN 856
High-pressure hose for deck winches and thruster systems
Raw Water Cooling Hose
Seawater intake and heat exchanger cooling hose assemblies
Stainless Hose Clamp Kit
316L stainless worm-drive clamps in assorted sizes
Quick Coupler Fuel Transfer
Flat-face ISO 16030 couplers for safe fuel tank-to-tank operations
Camlock Coupling Dry Break
Aluminum or stainless camlocks for rapid oil/fuel disconnect
JIC Hose Adapter Kit
Stainless steel 37-degree flange adapters for hydraulic lines
Fuel Hose Assembly SAE
Complete pre-assembled fuel lines with fittings and test certification
Silicone Coolant Hose
Reinforced silicone hose for fresh water jacket cooling loops
Hose Ferrule Assortment
Stainless ferrules and clamp collars for compression fittings
Deck Wash Hose
High-flow seawater wash hose for general deck cleaning
Pressure Test Hose
Temporary test hoses with quick couplers for system pressurization
Turbo Charge Air Hose
High-temperature intercooler and turbo manifold ducting
Cracking Adapters
Swivel JIC and NPT adapters for easy hose disconnection
Frequently Asked Questions
What does SAE J30R7 fuel hose mean?
SAE J30R7 is a fuel hose specification rating for diesel engines with specific wall thickness, temperature limits, and pressure resistance. R9 is a heavier version for higher pressure. Always match the SAE rating to your fuel system requirements to prevent failure.
Why is bend radius important for hose selection?
Hoses have a minimum bend radius below which they kink, restricting flow and potentially rupturing internally. Exceeding the minimum bend radius prolongs hose life and prevents system damage. Never force a hose into a tighter bend than specified.
Can I use galvanized clamps on marine hoses?
No. Galvanized clamps corrode quickly in seawater or humid marine environments. Always use 316L stainless steel clamps, which resist corrosion and maintain secure connections over vessel lifetime.
What is a flat-face quick coupler and when is it used?
Flat-face couplers use poppet valves that prevent fluid spillage when disconnected, ideal for fuel transfer operations where spills are hazardous. Poppet-style couplers are faster but allow some drip. Select based on your spill tolerance.
How often should fuel hoses be replaced?
Fuel hoses degrade over time due to UV, ozone, and fuel chemistry. Most marine guidelines recommend replacement every 5-10 years regardless of appearance. Inspect annually for cracks, swelling, or hardening and replace if found.
What is the difference between JIC and NPT fittings?
JIC (37-degree flange) fittings seat on a conical surface, providing a leak-free connection suitable for high-pressure hydraulic systems. NPT (National Pipe Thread) is a tapered thread best for lower-pressure applications. Use JIC for critical hydraulics.
Can I mix hose materials in the same system?
Mixing can work if materials are compatible with the fluid. However, consistency simplifies maintenance and reduces risk. Always ensure all materials are rated for your fluid type (fuel, hydraulic oil, coolant) and pressure requirements.
What is the proper way to install a worm-drive clamp?
Position the clamp over the barbed fitting overlap, leaving 1-2mm of hose extending past the fitting. Tighten the worm screw until snug but not over-tightened, which can cut the hose. Check after one week of operation and re-tighten if needed.
Delivery Footprint
Mercer Yachting delivers across the Mediterranean — Malta, Antibes, Palma de Mallorca, Barcelona, Genoa, Athens, Split — and worldwide via our global logistics network. Emergency parts dispatched same-day from our Malta hub.
Ready to Specify Hose Systems?
Our engine specialists can source OEM-specification hoses, clamps, and couplers for any marine application. Contact us with your hose diameter, service type, pressure, and temperature requirements for a rapid quote.