Mastercool 90289 — Red 90° Manual Shut-Off Valve 1/4" Flare with Flexible Hose (High Pressure)

90° Design for Tight Spaces - EPA-Compliant High-Pressure Refrigerant Containment

The Mastercool 90289 red 90-degree manual shut-off valve is designed for tight spaces where straight valves won't fit. Featuring needle valve design with flexible hose, this valve controls high-pressure refrigerant flow with a simple quarter-turn of the handle. EPA requires shut-off valves within 12 inches of charging hose ends to prevent unnecessary venting of refrigerant — using shut-off valves is much safer than allowing refrigerant to blow out during service.

90° Design: The Solution for Tight Spaces

The 90-degree angled design is specifically engineered for cramped engine bays, confined equipment spaces, and awkward service port locations where straight valves create clearance problems. The right-angle configuration keeps the valve handle accessible whilst allowing the hose to route around obstacles. This design transforms difficult high-pressure connections into straightforward service.

Why This Matters: High-pressure service ports are often located in the most awkward positions — behind engines, underneath dashboards, in tight equipment compartments. The 90-degree valve lets you connect and control refrigerant flow even when space is severely limited.

Needle Valve Design for Precise Control

The needle valve design provides precise refrigerant flow control with a simple quarter-turn of the handle. Unlike ball valves that are either fully open or closed, needle valves allow gradual flow adjustment if needed, whilst still providing positive shut-off when fully closed — essential for high-pressure applications.

Flexible Hose for Easy Positioning

The integrated flexible hose works in conjunction with the 90-degree design to provide maximum positioning flexibility. Route the hose around obstacles, absorb movement, and reduce stress on connections — all whilst maintaining easy access to the valve handle.

EPA, SAE, and UL Compliant

Meets all EPA, SAE, and UL requirements for refrigerant containment. EPA regulations require shut-off valves within 12 inches (30cm) of charging hose ends to prevent unnecessary refrigerant venting. Using proper shut-off valves protects the environment, reduces refrigerant waste, and demonstrates professional service standards.

Key Features

• 90° Angled Design — Perfect for tight spaces and awkward service port locations
• Needle Valve Design — Quarter-turn operation with precise flow control
• Flexible Hose — Easy positioning, reduces stress on connections
• Red Colour — High-pressure discharge side identification (standard industry colour coding)
• 1/4" Flare Connections — Standard SAE fittings for universal compatibility
• EPA/SAE/UL Compliant — Meets all refrigerant containment requirements
• Screws Onto Hose End — Easy installation on existing charging hoses
• Compact Design — Works where straight valves won't fit

Technical Specifications

• Model: 90289
• Colour: Red (high-pressure discharge side)
• Connections: 1/4" Flare x 1/4" Flare
• Valve Type: Needle valve, quarter-turn, 90-degree angle
• Hose: Flexible design
• Compliance: EPA, SAE, UL
• Design: Right-angle for tight spaces

Part of the 90259 90° Shut-Off Valve Set

The 90289 is the red (high-pressure) valve from the complete 90259 90° Manual Shut-Off Valve Set, which includes:

• 90269: Blue 1/4" x 1/4" (low-pressure suction)
• 90279: Yellow 1/4" x 1/4" (liquid line)
• 90289: Red 1/4" x 1/4" (high-pressure discharge)

Also Available

• 90389: Red 1/4" x 3/16" (automotive applications)

Why 90° Valves Are Essential for Tight Spaces

• Clearance — Right-angle design fits where straight valves create interference
• Accessibility — Valve handle remains accessible in cramped spaces
• Hose Routing — Easier to route hoses around obstacles
• Professional Installation — Proper valve placement without compromising access
• Reduced Stress — Less strain on connections in tight installations

Perfect For

• Automotive A/C service in cramped engine bays
• HVAC equipment with limited service port access
• Commercial refrigeration in confined spaces
• Any application where straight valves create clearance problems
• Mobile service operations requiring flexible valve solutions
• Upgrading existing charging hose sets for tight-space applications

How to Use

1. Install on Hose — Screw valve onto charging hose end (within 12 inches of manifold)
2. Connect to System — Attach hose to high-pressure service port with valve closed, 90° angle provides clearance
3. Open Valve — Quarter-turn to open and allow refrigerant flow
4. Close When Done — Quarter-turn to close before disconnecting
5. Disconnect Safely — Remove hose with refrigerant contained in valve

Colour Coding Standard

Industry-standard colour coding helps prevent connection errors:

• Blue (90269) — Low-pressure suction side
• Yellow (90279) — Liquid line / centre hose
• Red (90289) — High-pressure discharge side

90° vs Straight Valves: When to Choose Each

Choose 90° Valves (90259 Set) When:

• Service ports are in tight, confined spaces
• Straight valves create clearance problems
• You need to route hoses around obstacles
• Working in cramped engine bays or equipment compartments

Choose Straight Valves (90262 Set) When:

• Service ports have good clearance
• Straight-line hose routing is preferred
• Working in open, accessible locations

EPA-Compliant High-Pressure Refrigerant Handling for Tight Spaces

The 90289 shut-off valve brings EPA compliance to tight-space high-pressure applications. The 90-degree design solves clearance problems whilst the needle valve provides precise control and positive shut-off. By preventing refrigerant venting during hose connection and disconnection, you protect the environment, reduce refrigerant waste, and work safely — even in the most confined spaces.

90° design for tight spaces. EPA/SAE/UL compliant. Professional high-pressure refrigerant containment.