STW- 2B, 3B

Vapco Spray Tower Brass models are the heavy-duty upgrade for contractors who need daily commercial durability from their chemical sprayer. Same Viton-sealed, chemical-resistant foundation as the poly STW series, with brass wand, brass shut-off, and a 42″ hose for extended reach on rooftop units and commercial equipment.

Built for acid cleaners, daily commercial use, and contractors who measure equipment life in years, not seasons.

Brass Extension Rod & Shut-Off: Corrosion-resistant brass furniture handles acid and alkaline chemistries without degrading. More impact-resistant than poly on commercial job sites.
42″ Chemical-Resistant Hose: Nearly double the reach of the poly models. Set the tank down and work rooftop condensers without repositioning.
Genuine Viton Seals & Gaskets: Same fluoroelastomer throughout — resists concentrated acids, caustics, and solvents.
Integrated Safety Lock & Check Valve: Prevents accidental discharge and chemical backflow into the pump.
Fan Tip Nozzle: Even spray pattern across the coil face without concentrated streams that bend fins.

Brass Chemical-Resistant Pump Sprayers for Commercial HVAC | STW-2B, STW-3B

Same Viton Foundation. Built for the Jobs That Break Everything Else.

The poly Spray Towers handle residential and light commercial work all season. But if you are running acid cleaners daily, servicing rooftop equipment where gear gets dropped and kicked, or doing commercial PM routes that put 200+ cleaning cycles on a sprayer per year, you need hardware that matches the workload. The STW Brass series upgrades the core shut-off assembly to brass while keeping every Viton seal and gasket that makes the STW platform chemical-proof. The brass valve does not crack when it gets dropped off a ladder or knocked around in a service van loaded with tools.

Manufacturer’s Tech Note: The brass upgrade is primarily about durability at the main stress point: the shut-off valve. The chemical resistance of the sealing system, the 42″ hose, and the wand are identical across all STW models. If you are choosing between poly and brass based on chemical compatibility alone, both handle the full Vapco product line. Choose brass when the physical demands of the job site require it, or when you want equipment that lasts years of daily commercial use instead of a season.

What the Brass Upgrade Gets You

COMPONENT	POLY (STW-1/2/3)	BRASS (STW-2B/3B)
Shut-Off Valve	Poly shut-off with Viton gaskets	Brass-plated shut-off with Viton gaskets. Impact-resistant and built for daily commercial abuse.
Extension Wand	18″ Wand	18″ Wand — Identical to poly models.
Hose	42″ chemical-resistant	42″ chemical-resistant — Identical to poly models.
Seals & Gaskets	Viton throughout	Viton throughout — Identical sealing system.
Tank	Translucent poly with funnel top	Translucent poly with funnel top — Identical tank construction.
Safety Lock & Check Valve	Yes	Yes — Identical safety features.

Why Viton — and Why It Matters for Your Seals

This is not marketing language. It is materials science.

SEAL MATERIAL	CHEMICAL RESISTANCE	FIELD LIFESPAN
Standard Rubber	Swells and softens on contact with concentrated alkaline or acid cleaners.	1-3 uses before failure.
EPDM	Handles mild chemicals. Degrades under concentrated caustics and aromatic solvents.	Weeks to a few months depending on chemistry and frequency.
Viton (FKM)	Resists concentrated acids, caustics, aromatic and aliphatic solvents, and petroleum products.	Full cooling season or longer with daily rinsing after use.

Select Your Size

Both brass models share the same upgraded hardware. The only difference is tank capacity.

MODEL	CAPACITY	BEST FOR
STW-2B	2 Gallon	Daily Commercial Service: The right balance of capacity and portability for contractors doing commercial PM work with acid or alkaline cleaners.
STW-3B	3 Gallon	High-Volume Commercial & Rooftop: Maximum capacity for extended commercial runs so you spend less time mixing and more time cleaning.

Looking for the Poly Models?

The STW-1, STW-2, and STW-3 poly models share the same Viton sealing system at a lower price point. Ideal for residential PM work and contractors who do not need the brass durability upgrade. Available in 1, 2, and 3 gallon sizes.

Maintenance Tip: Rinse the tank, hose, and wand with clean water at the end of every work day. This takes two minutes and adds months to the life of your seals. Even Viton degrades faster when chemical sits on it overnight.

Compatible Vapco Coil Cleaners

Spray Towers handle the full Vapco liquid product line. – Coil Cleaning

Contractors: Please contact your local Vapco distributor for pricing and availability.

Poly vs. Brass: Quick Decision Guide

GO POLY IF…	GO BRASS IF…
You primarily do residential PM work.	You do commercial work daily and need gear that takes a beating.
You run alkaline cleaners (Foaminator, Mongoose, Blue 41).	You run acid cleaners regularly and want maximum corrosion resistance.
You want the lowest cost of entry with full Viton protection.	You want equipment that lasts years, not seasons.