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ZeroR R1234YF_ Max Dry contains a dehydrating agent that converts system moisture into oil We recommend the use of R1234YF_ Max Dry before the use of ZeroR Max Seal to ensure all moisture has been removed from the air conditioning system. The 4 ounce aerosol can contains enough R1234YF_ Max Dry to work in 3 or 4lb ac systems. R1234YF_ Max Dry is perfect for the single use and may be used in R1234YF ac systems. "R134_ can tap threads and suggest using "ZeroR R134a_ Can to R1234YF_ Port Can Tap with Gauge" IMPORTANT: These cans are R134 can tap threaded (left hand thread) A R1234YF can tap will not work on this can and we suggest using ZeroR R134a Can to R1234YF Port Can Tap with Gauge