Mastercool A/C System Flush Kit with Flush Gun, 33 oz Canister — 36" Hose, 90–150 PSI Professional HVAC/R Cleaning

Mastercool 91046-A is a professional A/C system flush kit that pairs a flush gun, 36" hose, 33 oz. aluminum canister and adapter to purge oil, debris and sludge from condensers, evaporators and hoses using shop air.

This all-hardware kit lets technicians quickly set up a controlled flush process when retrofitting systems, replacing compressors, or cleaning individual components. The toolset is built for compatibility with any lightweight flushing solvent that can be atomized with compressed air, and it runs on standard shop pressures between 90 and 150 PSI. The kit does not include solvent and is not intended for flushing compressors, expansion devices, or filter/drier components.

How does the Mastercool 91046-A remove oil and debris from A/C components?

The kit converts shop air into a high-velocity flushing stream that dislodges and carries out refrigerant oil, sludge and particulate from lines, condensers and evaporators. Using a dedicated canister and a 36" hose, the flush gun directs solvent-air mixture through the component until the discharge runs clean.

• Operates at 90–150 PSI to generate effective flow and cleaning power.
• Flush each component individually — hoses, condensers, evaporators.
• 33 oz. aluminum canister holds solvent for one-person operation and easy handling.
• Compatible with common refrigerant systems (R134a, R1234yf, R12, R22, R410a) when paired with appropriate solvent.

What are the setup and safety limits technicians need to know?

Setup is straightforward: attach the canister to the flush gun via the supplied adapter, connect the 36" hose, and feed shop air to the gun. Respect the equipment’s rated pressure and component exclusions to avoid damage or safety hazards.

• Max rated pressure: 150 PSI — do not exceed this limit.
• Operating range: 90–150 PSI for consistent performance.
• Do NOT flush compressors, expansion valves, orifice tubes, filter driers, or accumulators with this kit.
• Flush solvent must be compatible and is sold separately (see Mastercool 91049 line).

Which solvents and systems are compatible with the 91046-A kit?

The flush gun and canister are solvent-agnostic for lightweight solvents that can be mixed with compressed air, giving shops flexibility to choose chemistry based on the refrigerant and contamination type. Mastercool recommends using approved flushing agents and following solvent manufacturer guidance.

• Compatible with solvents intended for mixing with pressurized air (solvent not included).
• Suitable for use on systems charged with R134a, R1234yf, R12, R22 and R410a when solvent is appropriate.
• Mastercool 91049 line offers compatible flush solvents in multiple sizes.
• Always follow solvent handling, ventilation and disposal requirements.

Who is this for: The Mastercool 91046-A A/C System Flush Kit is aimed at automotive and HVAC/R technicians, shop owners, and retrofit specialists who need a durable, simple-to-use flushing tool for component-level cleaning. It’s ideal for professionals who prefer a hardware-only solution that pairs with their chosen solvent, appreciate a proven U.S.-based brand, and require a kit that performs reliably at standard shop pressures. If you need an all-in-one flushing gun, hose and canister package with broad solvent compatibility and clear pressure limits, this kit provides the hardware to get that job done.