What is the thread size of the breathers?

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Size 107 and 115 - 1/4 NPT Size 203 and 207 - 3/8 NPT Size 215 - Breather is 1/2 NPT using 3/4 NPT adapter Size 307 through 608 - Breather is 3/8 NPTF using a 3/4 NPT adapter.