Bear, something like this: Copper Saddle Valve, 3/8, PK 5 - Refrigeration Access Valves - AC Refrigeration - 3DXE6 : Grainger Industrial Supply is often used along with a set of pressure gauges to identify if refrigerant is still in a system. The link that I'm citing is for a 3/8"OD pipe connection for around $6.00 each. Shopping around will knock this price down significantly. Also, for small appliances there are "compression/self-piercing" style fittings that will allow you to test for a charge as well as evacuate the refrigerant.
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