It literally is just a Mazda cap with a hole drilled in the middle, a barb fitting put in the hole, and then JB weld or something else that seals REALLY well (has to hold up to psi).
I wonder if the Miata cap they sell fits?
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1976 Mazda Cosmo RX-5
1976 Mazda Cosmo RX-5
2003 Toyota Tundra TRD
2015 Toyota 4Runner SR5
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