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The disposable tank has a schrader valve at the top with a screw on regulator. Inside the regulator there is a fixed pin to depress the valve. That means when you are attaching the regulator you need to work quickly to thread it on since it will leak while you are tightening it until it seals. I put the regulator on twice so lost quite a bit of nitrogen.
I might try the leak detector.
I am running r134a. My understanding is i need approximately 80% of the r12 capacity - which is 2.9lbs according to the original sticker.
2.9 lbs = 46.4 oz
46.4 * 0.8 = ~37oz - which should mean I need 3 12 oz cans plus a little bit.
Does that seem right?
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