ATP Turbo Adapter Fitting ( Aka Threaded Bushing / Sleeve ) 1/4" NPT Male To 1/8" NPT Female Stepdown
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Sometimes the fitting you want to use is only available in 1/8" NPT male, however, your turbo (or mating part) is 1/4" NPT female.
This part has 1/4" NPT male threads to screw into your part and converts it to 1/8" NPT female. This way, now you can screw accept any part with an 1/8" NPT male on it.