Mastercool A/C System Flush Kit 91046-A — 33 oz Canister, 36" Hose & Flush Gun for Fast Component Cleaning

The Mastercool 91046-A A/C System Flush Kit is a complete, shop-grade flushing assembly that lets technicians quickly purge oil, sludge, and debris from individual A/C components using pressurized air and a compatible solvent.

This compact kit bundles a durable flush gun, a 36-inch reinforced hose, a 33-ounce aluminum canister and a canister adapter so you can begin component flushing immediately (solvent sold separately). It’s built for repeated use in automotive and HVAC/R environments and is compatible with common refrigerant systems when used with an appropriate lightweight flushing solvent. The tool focuses on speed and reliability while avoiding sensitive parts that must not be flushed, such as compressors or orifice tubes.

How does this kit speed up retrofit and compressor-replacement work?

The 91046-A is designed to make component-by-component flushing fast and repeatable. With standard shop air you create a high-velocity stream that dislodges oil residues and particulate from condensers, evaporators, and hoses before reassembly.

• Includes ready-to-connect flush gun and 36" hose for reach and maneuverability.
• 33 oz. canister holds solvent for controlled bursts of flush media.
• Operates on 90–150 PSI typical shop air for effective solvent flow.
• Canister adapter simplifies attachment of common aluminum cans.

What components can I safely flush with the 91046-A?

Use the kit to clean non-moving, serviceable components where solvent flow can pass freely and contaminants must be removed prior to installation of new parts. The kit is not intended for internal compressor flushing or tiny metering devices.

• Recommended: hoses, condensers, evaporators, intercooler passages where accessible.
• Not recommended: compressors, expansion valves, orifice tubes, filter driers, accumulators.
• Flush each part individually to avoid cross-contamination of system elements.
• Observe solvent manufacturer instructions and local disposal rules.

Which solvents and refrigerant systems are compatible?

The hardware accepts any light flushing solvent that can be mixed with pressurized air; the kit itself contains no chemical so you choose the chemistry matched to your application and refrigerant. Mastercool offers compatible solvents separately if you prefer a single-source option.

• Works with solvents suitable for use with R134a, R1234yf, R12, R22, and R410a systems.
• Flush solvent is not included — consider Mastercool 91049 series for shop-ready options.
• Ensure solvent and system compatibility before flushing to protect components.
• Maintain proper ventilation and PPE when handling solvents and aerosols.

What pressure and safety limits should I follow?

Designed for common shop air, the kit performs best between 90 and 150 PSI; do not exceed the 150 PSI maximum rating. Follow standard shop safety practices to prevent damage to parts and to protect operators from pressurized solvent spray.

• Operating range: 90–150 PSI; maximum rated pressure: 150 PSI.
• Do not over-pressurize the canister or exceed rated hose/gun limits.
• Use eye protection, gloves, and suitable containment for solvent runoff.
• Dispose of used solvent and contaminated materials per regulations.

Who is this for? The Mastercool 91046-A is aimed at professional automotive and HVAC/R technicians, retrofit specialists, and busy service shops that need a durable, simple-to-use flushing solution without electronic components or elaborate maintenance. If you routinely perform compressor changes or component overhauls and want a compact kit that pairs with your chosen flush chemistry, this kit gives the core hardware to start flushing quickly while relying on Mastercool’s long-standing support and warranty options.