Racetech straight male to female adaptors, available in a wide range of useful metric and imperial sizes, very useful when plumbing in gauges to enable stepping up or down in thread sizes or converting from metric to imperial or vice versa. These straight are typically inserted into an engine block, cylinder head, alloy sump, oil filter housing etc, and usually with some PTFE tape or thread sealant as required, with care not to over tighten.
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