Numatics base assembly kit has 3/8" NPTF connection and is for use with Mark 15 series direct solenoid/pilot valves Brand Name|Numatics#MFR Part Number|203-359#UNSPSC|40141616#Item|Base Assembly Kit#Port|Side#Connection Size|3/8 in#Connection Type|NPTF#Suitable For Use With|Mark 15 Series Direct Solenoid/Pilot Valves