Description
Product Description The Hongsen HS-ML is a professional-grade manual quick coupler designed for automotive air conditioning technicians. Engineered specifically for the low-pressure service port of vehicle R134a A/C systems, this coupler features a quick-connect sleeve with an internal ball-bearing latching mechanism that snaps securely onto the vehicle’s service port without leaking. Machined from high-grade brass and aluminum with an ergonomic, knurled blue aluminum control knob, the HS-ML utilizes an adjustable plunger design. Rotating the knob depresses the vehicle’s Schrader valve core to allow refrigerant flow safely, minimizing the risk of refrigerant loss or frostbite during connection and disconnection. Technical Specifications Brand: Hongsen Model: HS-ML (Low Pressure Side / Blue) Material: Heavy-duty Brass and Anodized Aluminum construction Interface Thread: 1/4″ SAE Male Flare (connects to standard manifold gauge hoses) Coupler Type: Manual Adjustable Quick Coupler (6-ball locking mechanism) Model Variations & Pairs In automotive HVAC servicing, this low-side coupler is typically used alongside its matching high-side companion: HS-ML (Blue Knob): Designed exclusively for the Low-Pressure side service port of the vehicle. HS-MH (Red Knob): The matching high-pressure companion designed exclusively for the High-Pressure side service port. HS-134: Frequently sold together as a complete 2-piece high/low manual adapter kit. Compatible Products & Equipment The HS-ML coupler acts as an essential bridge between a vehicle’s A/C system and your service tools, making it fully compatible with: Automotive A/C Ports: Fits standard R134a low-side service ports found on most passenger cars, trucks, and SUVs built prior to the transition to R1234yf. Manifold Gauge Sets: Connects directly to the 1/4″ SAE female flare couplers on the blue (low-pressure) charging hose of standard HVAC/R manifold gauges. Refrigerant Recovery Equipment: Connects to recovery systems, vacuum pumps, and electronic recharging stations during standard evacuation and gas refill operations.





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