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Q:How much liquid is in this refill?
A:The 3392 refill is for Type 339 gauges and it contains 28cc's of Red-X. The gauge operates with 27cc's but we always add 1cc extra in the event of spillage. Types 112 through 227 use Refill P/N 1122 - 21cc refill. You can't go wrong with a bigger refill, you'll just end up with extra fluid for the next time.