Robinair R-134a Charging Hoses Set of 2, 20 ft Red/Blue — Enviro-Guard Low-Permeation, 500 psi

Robinair 64240 Enviro-Guard hoses are a pair of 20-foot, low-permeation R-134a service hoses built for high-pressure automotive refrigerant charging.

These red and blue 240" (20') hoses are designed for technicians who need a durable, long-life connection when servicing R-134a automotive systems. They combine a flexible Enviro-Guard barrier that minimizes refrigerant loss with rugged hardware — 14 mm male to 1/2" ACME female fittings and a heavy six-sided crimp — so the set withstands everyday shop use and retains reliability under pressure.

How do these hoses reduce refrigerant loss during service?

The Enviro-Guard construction uses a special internal barrier that resists permeation while keeping the hose flexible. That means far less refrigerant migration compared with standard hoses over time, which helps maintain system charge and reduces waste.

• Barrier material formulated for minimal R-134a permeation
• Still flexible for routing around engine compartments
• Marked specifically for R-134a to prevent cross-use

Are they strong enough for high-pressure A/C work?

Yes — the hoses are rated for a 500 psi working pressure and a 2500 psi burst pressure. The hose-to-barb connection uses a six-sided crimp that secures the fitting under maximum loads, and the metal fittings are machined for reliable sealing.

• 500 psi working pressure for routine service
• 2500 psi burst rating for safety margin
• Six-sided crimp for consistent mechanical retention

What fittings and features make them easy to use in the shop?

Each hose has brass 14 mm male to 1/2" ACME female fittings to mate with common service ports and gauges. The coupler nuts are deeply knurled to allow quick finger-tightening and a positive grip, so connections are fast and secure without tools in many situations.

• 14 mm male x 1/2" ACME female fittings for broad compatibility
• Deeply knurled coupler nuts for quick hand tightening
• Clear red and blue coloring and R-134a markings to prevent mix-ups

How long will these hoses last under regular use?

Robinair manufactures these charging hoses for extended service life by combining a low-permeation core with robust external construction and quality fittings. Proper handling and storage will maximize longevity, but the design targets professional workloads in automotive and related mobile HVAC-R applications.

• Premium materials selected for durability and low permeation
• Strong brass fittings resist corrosion and wear
• 20-foot length reduces the need to move vehicle or equipment during service

Who is this for: This Robinair Enviro-Guard 64240 hose set is intended for professional automotive technicians, independent repair shops, fleet maintenance teams, and experienced DIYers who work on R-134a systems and need long, flexible hoses with low refrigerant loss and secure fittings. If you require reliable, shop-grade charging lines with clear service identification and high pressure ratings, this set provides a cost-effective, long-lasting solution.