The ST-510 poly trigger gun is Suttner's low-pressure soft wash gun, built for SH from an all-poly body with a stainless ball and Viton seals. There's no brass anywhere in the chemical path, so bleach won't corrode it. Flows up to 18 GPM at just 0.3 lb. Key Features No brass in the chemical path: The poly body, stainless V4A/316 ball and pin, and Viton seals shrug off the SH that eats brass guns alive. Viton seals: Viton doesn't swell or break down in chlorine, which is the number one way cheap guns fail. Low-pressure, high-flow: Rated to 18 GPM and about 362 PSI, matched to 12V and 24V soft wash pumps rather than a high-pressure washer. Trigger safety lock: The locking handle keeps the gun from spraying when you don't want it to. Light and cheap: At 0.3 lb it's the lightest genuine soft wash gun, and cheap enough to replace if it takes a fall off a ladder. With or without QC: Pick the bare gun or the version with a stainless quick-connect socket on the inlet. Specifications Brand / model Suttner ST-510 (part 200510500) SWT SKUs 200510500 (without QC) / 200510500-QC (with QC socket) Body Reinforced poly Ball & pin Stainless steel (V4A / AISI 316) Seals Viton (FKM) Max flow 18 GPM Max pressure 362 PSI (low-pressure gun) Max temperature 122°F (cold or warm water only) Ports 1/2" FPT female inlet and outlet Trigger Locking handle safety Weight 0.3 lb Chemical compatibility Sodium hypochlorite up to 12.5%, surfactants What's Included 1 ST-510 poly trigger gun Stainless quick-connect socket on the inlet (With QC option only) Built for soft wash systems running 12V, gas, or air diaphragm pumps, from a Remco 12V up to a Zeus 24V. Match the gun's 18 GPM ceiling to your pump. Both ports are 1/2" female, so they take 1/2" barbs, reducers, and QC sockets. It has no built-in swivel, so add a live swivel if you want one. Don't run it on a high-pressure pressure washer or above 122°F, since that will damage it. How the ST-510 Poly Trigger Gun Works The ST-510 sits at the end of your soft wash hose. Pull the trigger and a stainless ball lifts off its seat to release your mix; release it and the ball reseats to stop flow. The whole wetted path is poly, stainless, and Viton, so daily 12.5% SH runs through it without corroding brass or swelling seals. That's the difference between a real soft wash gun and a repurposed pressure-washer gun that weeps at the threads in a few months. It's a low-pressure, high-flow gun rated to about 362 PSI and 18 GPM. Feed it with a soft wash pump, not a high-pressure washer, and keep the water under 122°F. Flush the gun with clean water after each job to get the most life out of the seals and spring. There's no rebuild kit for the ST-510, so at around $25 it's a replace-not-repair part. Pairs Well With Remco 12V Soft Wash Pump 5.3 GPM Rampage Soft Wash Hose Soft Wash Shooter Tip Suttner ST-515 Soft Wash Gun Frequently Asked Questions What's the difference between the With QC and Without QC ST-510? Fittings. The With QC version adds a stainless quick-connect socket on the inlet so you can snap it on and off your hose. The Without QC version is the bare gun with 1/2" threaded ports. Same gun otherwise. Is the ST-510 safe for bleach and SH? Yes. The body is poly, the ball and pin are stainless, and the seals are Viton, so there's no brass to corrode. SWT rates it for daily 12.5% SH. Rinse it with clean water after each job to protect the seals. Should I get the ST-510 or the High Flow soft wash gun? The ST-510 is full poly with no metal in the chemical path, the lightest and cheapest genuine soft wash gun. The High Flow Soft Wash Gun uses a plastic housing over stainless internals with Viton seals and suits higher-flow AR45 rigs. Both are SH-safe.
