Service sets
First, determine what refrigerant you work with. R134a and R1234yf have different quick couplings. The wrong choice gives leaks. These sets contain gauges, hoses, and connectors. You use them to measure pressure and recharge. A set with a vacuum pump handles a full recovery and refill. Check the connection size of your existing equipment before ordering.
Choose the right AC service set
Which refrigerant do you use?
First determine whether you work with R134a or R1234yf. The quick couplings differ per refrigerant. A wrong set leaks immediately. Always check the connection type on your equipment.
What is in the set?
A complete service set includes pressure gauges, hoses, and couplings. This lets you measure pressure and top up. For a fully system overhaul, choose a set with a vacuum pump. It removes moisture and air from the circuit.
What to check when ordering?
Check the connection size of your workshop equipment. Sizes vary by brand and type. Measure existing couplings or consult the manual. This prevents buying a set that does not fit.
If your set does not fit the machine, look at adapters or service couplers. For maintaining your equipment itself there are service unit spare parts, filters and hoses and accessories. Everything around air conditioning maintenance is in the parent category.