These adaptor suit:
Turbosmart External Wastegate range / Blow Off Valves and Fuel Pressure Regulators including:
WG38 38mm UltraGate
WG40 40mm CompGate
WG45 45mm HyperGate
Race Port BOV / RacePort
Vacuum port on FPR 800 / FPR 1200 / FPR 2000 / FPR 3000 / FPR800 / FPR1200 / FPR2000 / FPR3000
Allows the use of 1/8NPT fittings with the smaller 1/16NPT reference ports.