Another annoying question. Is there better Schrader valve and cap adapter assemblies out there I should get before doing the evac. and charge? The Schrader valves look to be the standard type. The caps are plastic with a black O-ring or seal inside. It seems that brass caps might be better. Thoughts...

The teflon tape isn't near the O-ring just on the adapter threads. The idea is if R134a leaks past the O-ring it might be stopped by the teflon tape.
I'm well aware how the tape works on NPT threads.

Thanks Tim and Cusser, It looks like HNBR O-rings come in black or green. They may not be exactly the same (e.g. different durometer) https://www.globaloring.com/oring-colors/ I guess I'll assume the QD fittings for R134a will be OK. It makes sense after all this time at least the R134a fittings sho...

This paper, talking about O-ring material, appears to come from an independent and reliable source. The company is Four Seasons - I think they are based in Europe and sell a wide range of mobile AC components. This could be a questionable source but the best I could find so far. The Parker O-ring co...

Do you think the person at Denso is playing a trick of some sort on me by recommending dumping the mineral oil out of the new compressor and filling with PAG 46? Anyone heard of this? I've drained compressors, flushed out the inappropriate type of oil, flushed with type I wanted (twice, 6 oz. each ...

Another question.
When switching over the manifolds from an old compressor to a new compressor (R12 system to R143a system) should the mainifold O-rings be green (HNBR) instead of black?

I found some more info. regarding mixing mineral oil and PAG. It seems it is OK if there is no more than 1% of mineral oil. https://www.epatest.com/faq/609/#ET-15 See technical question #13. I now have a large amount of ester oil (32 fl. oz.) I could use that for multiple flushes of the new Denso co...

The current conventional wisdom is not to mix mineral oil and PAG oil. Do you think the person at Denso is playing a trick of some sort on me by recommending dumping the mineral oil out of the new compressor and filling with PAG 46? Anyone heard of this? I'm thinking there are two situations, that a...

Could be my problem, I don't know how to use the internet after using it for 20 years. - I just tried to select the lowest freight.
Please feel free to adjust the freight.

I guess it is Santech so it should be good.
Ordered 2 bottles from ACKits.