Yellow Jacket PLUS II Hoses: Preventing Permeation & Moisture Contamination
In high-pressure HVAC systems operating with refrigerants like R-410A, R-32, and R-454B, the charging hoses connecting your manifold to the service ports are subjected to intense mechanical stress, temperature extremes, and chemical exposure.
Using worn or substandard generic rubber hoses leads to two serious problems: atmospheric moisture permeating into the line set during deep vacuum and refrigerant loss during high-pressure disconnects.
1. The Science of the PLUS II Nylon Permeation Barrier
Standard all-rubber hoses are porous at the molecular level. Under deep vacuum conditions (below 500 microns), atmospheric moisture actually penetrates through the rubber hose wall into the evacuation stream.
Yellow Jacket PLUS II Charging Hoses feature a specialized multi-layer construction with an internal extruded nylon barrier that reduces refrigerant and moisture permeation by over 90% compared to standard rubber hoses.
2. 4000 PSI Burst & 800 PSI Working Pressure
Safety is critical when charging or diagnosing modern inverter systems that operate at head pressures exceeding 400–500 PSIG on hot summer days. PLUS II hoses are tested to a minimum 4000 PSI burst pressure and an 800 PSI working pressure, providing a 5-to-1 safety factor.
- Double-Crimped Brass Collars: Heavy knurling prevents fitting blow-off under pressure surges.
- Color Coded Flexibility: High-visibility red, blue, and yellow outer jackets remain flexible even in freezing sub-zero winter temperatures.
- Compact Ball Valve End Fittings: Allows technicians to trap refrigerant in the hose before unhooking, protecting fingers from frostbite and preserving system charge.
3. Maintaining Gaskets and Valve Depressors
Even the finest charging hoses require routine gasket replacement. Worn or flattened neoprene gaskets allow air to enter during vacuum operations. Inspect your hose ends monthly and replace with genuine Yellow Jacket gasket and depressor kits (Model 18975).
Equip your gauges with genuine Yellow Jacket PLUS II charging hose sets (Model 21985) available at Texpert Deals.
