Soft Wash Guns & Wands

How to Choose the Right Soft Wash Gun

Picking a soft wash gun depends on matching the gun to your pump's flow rate, getting the right materials for chemical exposure, and dialing in the ergonomics so your hand survives an 8-hour day. Get the flow wrong and you'll choke your pump or blow past the trigger's rating. Get the materials wrong and your gun is dead in 90 days.

Match GPM to your pump

Every soft wash gun has a maximum GPM rating. Run a gun beyond its ceiling and you'll force water past the seals and stress the trigger mechanism. Run a high-flow gun on an undersized pump and the trigger won't actuate cleanly, the spray pattern fragments, and you waste chemical. The ST-510 handles up to 18.5 GPM, the High Flow Gun is rated for 16 GPM, and the WaterBoss 750 sits at 12 GPM. The Mezzo SuperShot ships in three GPM-specific variants (1 to 3, 3 to 7, and 7 to 12) so you can match it exactly to your pump. Use the sizing chart below as your starting point.

Chemical compatibility

Soft wash means running 6 to 12.5% sodium hypochlorite through your gun every day. Brass-bodied pressure washer guns (even "premium" ones) corrode through within a few months of regular SH contact. The guns in this collection split into two housing styles: poly-housed (ST-510, High Flow Soft Wash Gun) and certified lead-free stainless steel (WaterBoss 750). The ST-510 runs a full poly body with no metal in the chemical path. The High Flow Gun pairs a shockproof plastic housing with brass internals, an AISI 303 stainless steel piston, and Viton seals. All three combinations hold up to daily 12.5% SH exposure. Brass-bodied pressure washer guns don't.

Ergonomics, swivels, and shooter setups

Trigger pull weight, handle balance, and whether you have a trigger-lock matter more than spec sheets when you're 20 feet up a ladder. The WaterBoss 750 has a long trigger and a trigger stay so you can lock continuous flow without squeezing. The Mezzo SuperShot combines a trigger, an AJH adjustable nozzle, and an extended-range shooter tip on one assembly, so you can switch between fan spray and long-range stream without breaking down the gun. A live swivel like the Waterboss SS Swivel reduces hose drag, extends hose life, and saves your wrist on long jobs. Most pros add one to whatever gun they're running.

Soft Wash Gun Sizing Chart

Match the gun to your pump's flow rate. The pairings below reflect the gun recommendations from each pump's product page.

Related Categories

• Soft Wash Pumps
• Soft Wash Hoses & Reels
• Soft Wash Nozzles
• Pressure Washer Wands & Extensions
• Complete Soft Wash Systems

Frequently Asked Questions

What's the difference between a soft wash gun and a pressure washer gun?

A pressure washer gun is built for high pressure (typically 3,000 to 4,500 PSI) but low flow (typically 4 to 8 GPM), usually with brass internals that corrode under sodium hypochlorite. A soft wash gun is the opposite: low pressure (350 to 750 PSI) and high flow (12 to 18+ GPM), with poly or stainless construction and Viton seals that survive daily SH exposure. Using a pressure washer gun for soft washing chokes your flow and kills the gun within months from chemical attack.

What size soft wash gun do I need?

Match the gun's GPM rating to your pump's output. A Remco 12V pump (5.3 or 7 GPM) pairs with the ST-510 or the Mezzo SuperShot (3 to 7 GPM variant). A Comet P40 at 11 GPM is officially paired with the WaterBoss 750 for maximum spray distance. An AR45 at 11.4 GPM ships with the High Flow Soft Wash Gun on its product page. Both guns work in the 7 to 12 GPM range and just have different strengths. For a Remco Zeus 24V at 14 GPM or any larger commercial pump, step up to the High Flow Soft Wash Gun or ST-510.

Do I need a swivel for my soft wash gun?

It's not strictly required, but most pros run one. A live swivel like the Waterboss SS Swivel lets your hose rotate freely while it's under pressure, so it stops fighting you when you change angles around corners, eaves, and ladders. It reduces hose drag, extends hose life, and saves your wrist on long jobs. Most guns ship without a swivel, so add one separately.

Can I use a soft wash gun with a 12V pump?

Yes, but only the lower-flow guns. The ST-510 Poly Trigger Gun and the Mezzo SuperShot in its 1 to 3 GPM and 3 to 7 GPM variants work with 12V pump flow rates. Don't pair a 12V pump with the WaterBoss 750. Its product page specifically warns against use with 12V pumps or high-pressure systems to prevent damage or safety issues.

Poly vs stainless steel soft wash guns: which lasts longer with bleach?

Both poly-housed and stainless-housed guns hold up to daily SH when the seals are Viton. The difference is what's inside the shell and how it feels in your hand. The ST-510 is a full poly body with no metal in the chemical path. It's the simplest chemistry, the lightest weight, and cheap to replace if you drop it off a ladder. The High Flow Gun has a plastic outer housing over brass internals with an AISI 303 stainless steel piston and Viton seals, so it's chemical-resistant and a natural fit for high-flow AR45 setups. The WaterBoss 750 is certified lead-free stainless throughout. It's heavier and more abuse-tolerant, which is what you want for daily commercial work where the gun gets dragged across rooftops.

What's a shooter tip and when do I need one?

A shooter tip is a long-range nozzle that focuses the spray into a narrow stream so you can hit second and third-story surfaces from the ground. The Mezzo SuperShot includes a HydroJet ER (Extended Range) shooter tip plus an AJH adjustable nozzle on the same wand, so you can flip between long-range shooter and close-up fan without swapping fittings. You need a shooter any time you're cleaning two-story houses, parapet walls, or commercial signage from ground level.