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Servicing window type air conditioning units with sealed systems?

I work in the Philippines where most of the window type air conditioning systems have no ports for adding refrigerant. There is supposedly a pinch connector you can use to puncture the line for servicing. The pinch remains in the line permanently. Where can I find more information on this adapter or pinch for servicing or recovering sealed A/C systems?

Public Comments

1. Bolt on service ports are available through most HVAC supply houses in the USA. These work well for recovery, but tend to leak if left in a system so I won't put them in anything that's going back into service.