Reliable Couplers & Pressure Gauges for Heavy Haul Trailers, Trucks & Equipment

Your Heavy Haul Hydraulic Solution

When it comes to heavy haul transportation, reliable solutions are key to successful jobs. At Summit Hydraulics Texas, we’ve spent more than 30 years delivering durable hydraulic parts and systems that keep SPMT trailers, modular trailers, and oversized load equipment performing under the harshest conditions. From screw-to-connect couplers y test couplers a liquid-filled pressure gauges and custom mangueras hidráulicas, our products are engineered for the unique demands of heavy haul hydraulics.

We do more than sell trailer parts. We provide specific hydraulic solutions that improve your operations’ efficiency and uptime. Whether you’re moving refinery modules, bridge sections, or industrial equipment, you can trust Summit Hydraulics to deliver the heavy haul hydraulic parts that keep your operation on schedule and on track.

We’ve spent more than 30 years delivering durable hydraulic parts and systems that keep SPMT trailers, modular trailers, and oversized load equipment performing…

Flat Face Screw-to-Connect Quick Couplers

Summit Hydraulics Flat Face Screw-to-Connect Hydraulic Quick Connect Couplers are engineered to withstand the tough demands of heavy haul and specialized transport equipment. The flat-face design minimizes fluid loss and keeps contaminants out, while the screw-to-connect mechanism ensures a secure, leak-free seal even under 10,000+ PSI, constant vibration, and shifting loads. Built from magnetic carbon steel and coated with corrosion-resistant zinc-nickel plating, these couplers are durable and reliable in the harshest working environments.

These couplers are trusted in heavy haul applications, including:

• SPMT (Self-Propelled Modular Transporter) trailers – for hydraulic steering, suspension control, and axle lift systems.
• Modular platform trailers – connecting hydraulic lines that synchronize steering and leveling across multiple axle lines.
• Bridge and refinery module transport – maintaining secure hydraulic connections during slow, high-stakes moves.
• Construction and mining hauls – powering hydraulic rams, suspension, and brake systems in oversized load carriers.
• Heavy equipment relocation – ensuring clean, reliable connections when coupling hydraulic power packs to trailers and jacks.

If you are hauling a 500-ton transformer or maneuvering through tight refinery corridors, Summit’s screw-to-connect couplers provide a secure connection that keeps operations moving efficiently. We carry Group 2- 3/8″ body, Group 3- 1/2″ body, Group 4- 5/8″ body, Group 6- 3/4″ bodyy Group 8- 1″ body couplers.

The flat-face design minimizes fluid loss and keeps contaminants out, while the screw-to-connect mechanism ensures a secure, leak-free seal even under 10,000+ PSI

Recommended products

Diagnostic Test Couplers

Summit Hydraulics Test Couplers deliver dependable hydraulic diagnostics in the most demanding heavy haul environments. Whether performing pressure checks, fluid sampling, or system venting, these couplers provide fast, accurate measurements without interrupting operations. Built from rugged steel and finished with corrosion-resistant zinc-nickel plating, they’re designed to handle up to 9,137 PSI working pressure. A robust metal cap protects the connection and stays locked in place, even in high-vibration conditions common to heavy haul transport.

These test couplers play a critical role in heavy haul applications, such as:

• SPMT trailers – verifying hydraulic steering, suspension, and brake pressures during setup and operation.
• Multi-axle modular trailers – monitoring system pressure to keep axle groups synchronized and balanced under extreme loads.
• Power pack units – enabling quick fluid sampling and system venting to maintain hydraulic cleanliness and reliability.
• Construction and mining hauls – diagnosing hydraulic cylinders, pumps, and valves that drive suspension and lift systems.
• On-site service checks – allowing field technicians to confirm hydraulic performance without disassembly or extended downtime.

In order to move a refinery module or transport a turbine, Summit’s Test Couplers give operators the diagnostic confidence to keep heavy haul equipment efficient and operational. We carry BSPP y Metric thread diagnostic couplers.

Recommended products

Liquid-Filled Pressure Gauges

Summit Hydraulics Liquid-Filled Pressure Gauges deliver accurate, dependable readings in the toughest hydraulic environments. The liquid-filled dial minimizes pointer flutter caused by shock and vibration, ensuring accurate readings even when equipment is under constant strain. Available in multiple pressure ranges, these gauges give operators the flexibility to monitor systems across a wide range of heavy-duty applications. With both center-back and lower-back mounting options, installation is simple and adaptable to any setup.

In heavy haul operations, these gauges provide critical monitoring for:

• SPMT trailers – tracking hydraulic steering and suspension pressures across multiple axle lines.
• Modular platform trailers – ensuring balanced hydraulic load distribution during oversized transports.
• Power pack units – verifying pressure stability for trailer hydraulics, lift systems, and brake circuits.
• Heavy equipment transport – monitoring hydraulic systems on lowboys, multi-axle trailers, and oversized load carriers.
• Industrial service panels – delivering reliable system pressure data for shop and field maintenance teams.

When your operation depends on safe and accurate pressure control, Summit’s Liquid-Filled Pressure Gauges provide clear readings no matter what. Shop 0–60 BAR, 0–400 BARy 0–600 BAR options now!

Recommended products

Upgrade Heavy Haul Operations

Heavy haul projects leave no room for error. From steering multi-axle SPMTs to stabilizing oversized loads on modular trailers, every connection, every measurement, and every diagnostic check matters. That’s why Summit Hydraulics is not just a parts dealer; we provide complete hydraulic solutions built on 50+ years of industry expertise. We offer expediting shipping from locations across the country, or in-store pickup at our Texas Distribution & Service Center. Shop our Heavy Haul Hydraulic Parts today.

Heavy haul projects leave no room for error… Every connection, every measurement, and every diagnostic check matters.