The MTM Hydro Hi-Lo Trombone Valve is a 1/4-inch NPT female pressure washer valve that lets you switch between high-pressure rinsing and low-pressure chemical application at the wand. It is a practical upgrade for truck wash crews, mobile detailers, fleet wash operations, and serious home setups that need to move from soap application to rinsing without stopping to change a complete lance.
Why You Need The Hi-Lo Trombone Valve.
- Switch between a high-pressure rinse tip and low-pressure soap tip without breaking up your wash process
- Save time on fleets, semis, RVs, pickups, trailers, and equipment where every extra tool change adds up
- Keep your pressure washer wand setup simpler than carrying a separate dual-lance assembly
- Apply truck wash soap through your downstream injector, then move directly into high-pressure rinsing
- Reduce interruptions for mobile detailing crews working from a trailer, van, or wash skid
- Build a more efficient soap-and-rinse setup for touchless truck wash and foam cannon workflows
- Keep the right nozzle ready at the gun instead of setting tips down in wet, dirty wash areas
What Makes The Hi-Lo Trombone Valve Different?
This Hi-Lo trombone valve is a compact nozzle holder with two working positions: one for high-pressure washing and one for low-pressure chemical application. Instead of removing and reinstalling spray tips every time you change tasks, the valve lets the operator shift between the two modes at the wand.
It replaces the repeated nozzle swapping that slows down a normal pressure washer setup. For truck wash and fleet work, that means less downtime between pre-soak, soap application, and final rinse.
Recommended Pressure Washer Routine
- Shut off the pressure washer, release all trapped pressure, and disconnect the water supply before installing or servicing the valve.
- Confirm that the valve, spray gun, lance, fittings, hoses, nozzles, and pressure washer are compatible with one another before use.
- Install the valve using the two 1/4-inch NPT female connections and seal threaded fittings correctly.
- Install a properly sized high-pressure rinse nozzle in one position and a low-pressure soap nozzle in the other.
- Start with the low-pressure setting to apply your compatible truck wash soap through a downstream injector or chemical system.
- Allow the wash chemical to work according to its product label, and do not allow chemical to dry on the vehicle.
- Shift to the high-pressure setting and rinse thoroughly from the top down.
- Never point the wand at people, animals, electrical components, or delicate vehicle surfaces; always follow the pressure washer manufacturer’s operating and safety instructions.
Equipment & Setup Recommendations
The Hi-Lo Trombone Valve works best as part of a properly matched pressure washer soap system. Use it where quick changes between chemical draw and rinsing matter most, including mobile fleet rigs, wash bays, detailing trailers, and commercial truck wash operations.
- Pressure washer with a compatible spray gun and lance
- Downstream injector or compatible low-pressure chemical application system
- Correctly sized high-pressure rinse nozzle
- Low-pressure soap nozzle for chemical draw
- Truck wash soap, pre-soak, or vehicle-safe wash chemical matched to the job
