FYOU PMEC's API (American Petroleum Institute) Thread Gauges and Premium Connection Gauges have been used world wide and receiving the highest quality reputation.FYOU PMEC's Plants has been granted the right of use of API Official Monogram for the following API Thread Gauges since 2008; Specification 5B under the License No. 5B-0029, Specification 7-2 under the License No. 7-2-0629 FYOU PMEC supplies all kinds of Thread Gauges listed in the API