A/C O-Ring Kit - HNBR 350 Piece Assortment, 34 Sizes for R-134a & R-1234yf - Medco ATD-356 830.ORK350HNBR

Nothing wastes a shop day like a refrigerant leak you cannot seal because the one O-ring you need is the one size you do not have. This 350-piece HNBR A/C O-Ring Kit covers the most common seal sizes used throughout heavy-duty and automotive air conditioning systems, in a compartmented, refillable case that lives on the bench or rides in the service truck. We stock these heavily right here in our Hanover Park, Illinois warehouse to ensure lightning-fast shipping for fleets, diesel repair shops, and owner-operators nationwide.

The Right Rubber: The HNBR 350 Piece Kit Advantage

Material is the whole argument here. HNBR, hydrogenated nitrile butadiene rubber, is the correct compound for modern refrigerants, and these green O-rings seal reliably with R-134a and R-1234yf while resisting the swelling and cracking that kill standard nitrile seals. A general-purpose nitrile O-ring dropped into a modern system may hold for a week and then start weeping, which sends the truck back and leaves a technician chasing a leak the parts drawer created.

The kit carries 34 of the most common A/C O-ring sizes across its 350 pieces, so it covers the fittings a technician actually meets: compressor ports, discharge and suction hose connections, condenser and evaporator ports, receiver-driers, and expansion valves. Use it to stop refrigerant leaks anywhere in the circuit during A/C service, and refill the case rather than replacing it as sizes run down. This Automann kit cross-references to Medco ATD-356.

Vehicle Fitment & Compatibility

This universal A/C O-ring assortment is intended for the following applications:

• Make/Model: Universal - trucks, trailers and automotive systems
• Sealing Points: Compressor ports, discharge and suction hose fittings, condenser and evaporator connections, receiver-driers, expansion valves
• Refrigerant Compatibility: R-134a and R-1234yf
• Component Group: HVAC / A/C O-Rings & Gaskets

Direct Replacement & Cross-Reference Numbers:

This Automann A/C O-ring kit serves as a direct replacement for the following part numbers:

• Medco Interchange: ATD-356
• Automann Distributor #: 830.ORK350HNBR

Technical Specifications

• Component Type: A/C O-Ring Assortment Kit
• Piece Count: 350 O-rings
• Material: HNBR (hydrogenated nitrile butadiene rubber), green
• Sizes Included: 34 of the most common A/C O-ring sizes
• Refrigerant Compatibility: R-134a and R-1234yf
• Storage: Compartmented, refillable case
• Condition: New
• Warranty: 1-Year FleetPro Warranty
• Weight: 0.91 lbs
• UPC: 889626473180
• Product Level: Fleet Standard Aftermarket
• Brand: Automann (Distributed by FleetPro Parts & Tires)