The Mastercool 90328 is a drip-free refrigerant control valve with 1/4″ FFL x 1/4″ MFL threads. It’s built for licensed HVAC & refrigeration techs who want clean connections on charged systems—no mess, no dramas, just a tidy seal every time.

Key Features & Trade Benefits

• Ideal for charged systems → Attach gauges or hoses without dumping refrigerant or oil—safer for you and the system.
• Eliminates spray on connect → Helps prevent refrigerant, oil or dye from spurting when you crack the fitting. Fewer clean-ups, fewer call-backs.
• Brass body + swivel FFL → Durable brass with a 1/4″ FFL swivel coupler for quick, positive sealing on service hoses.
• Standard flare threads → 1/4″ FFL x 1/4″ MFL suits most manifold hoses and tools in the van—plug-and-play.

Why This Control Valve Matters

Real-world: you’re up on a roof in 40-degree heat, client breathing down your neck, and you need to slip a hose onto a live port. With the 90328 you spin-up the swivel, crack the valve, and there’s no misty spray—job stays clean and you’re back on the gauges in seconds. That’s a bloody good result and a safer workflow for everyone. For hose options that pair nicely, see Hoses & Couplings.

Pro Tip

Doing R32 jobs? The valve is a mechanical fitting, but your hoses still need to be R32-rated and in good nick—follow Australian refrigerant handling rules and keep emissions to a minimum.

Compatibility & System Info

• Threading: 1/4″ FFL (female flare swivel) x 1/4″ MFL (male flare).
• Use case: Hose/gauge connection on charged systems to reduce spray at connection.
• Other sizes available: 5/16″ FFL x 5/16″ MFL (90328-5/16) and 5/16″ FFL x 1/4″ MFL (90329). Check your manifold/hose sizes.
• Best practice: Use with sound hoses and proper PPE; follow Australian regulations for handling regulated refrigerants.

Local SEO Reference

Popular with service crews across Sydney and Brisbane for clean connects on roof-top units and coolrooms—she’ll be right when the fittings are tight.

What’s Included

• 1 × Mastercool 90328 control valve (1/4″ FFL x 1/4″ MFL)

Specifications

Specs per Mastercool product documentation.

Warranty & Returns

Backed by manufacturer warranty. HVAC Shop accepts returns on unused items in original packaging—see our Shipping & Returns policy for full details.

FAQs

Does the 90328 actually stop refrigerant spray?

It’s designed for use on charged systems and helps eliminate refrigerant, oil or dye from spraying during connections. Keep your hoses and seals in good condition for best results.

FFL vs MFL—what’s the difference?

FFL is a female flare with a swivel nut for easy tightening on hose ends; MFL is a male flare outlet to the mating port. This valve is 1/4″ FFL × 1/4″ MFL, the most common size on legacy manifolds/hoses.

Is this suitable for R32 work?

The valve is a mechanical flare fitting—use with R32-rated hoses and follow Australian refrigerant-handling requirements (licensing and controls).

Is it a core remover?

No—this is a control valve for clean connections. For removing Schrader cores to improve flow, grab a Mastercool Core Remover/Installer.

Related Products

• Mastercool 90430 Swivel Ball Valve (1/4″×1/4″) — Handy when you want fast isolation at the hose end without cracking fittings.
• Mastercool 90329 Control Valve (5/16″ FFL × 1/4″ MFL) — Use this size when you’re on newer R410A/R32 hoses but still need a 1/4″ outlet.
• R32-Rated Hoses — Pair with the valve to keep connections compliant and tidy.

For safe handling of regulated refrigerants in Australia (licensing and work practices), see the Australian Government guidance for technicians.