SP-VQ4000-PW-03T-M12 Individual sub-base for SMC VQ5000 series plug-in valves.

Individual sub-base for SMC VQ5000 series plug-in valves.
Port Size for P,A,B,5(R1), 3(R2):  3/8" NPTF
Port Size for PE and External Pilot Port:  1/8" NPTF
Electrical Connection:  M12 (Male on Sub-base)

Accessory or go together items there are a lot of potential valves to use with each one.  The most popular ones for the VQ4000 would be:

VQ4101-51
VQ4201-51
VQ4301-51
VQ4401-51
VQ4501-51
VQ4101-5W1
VQ4201-5W1
VQ4301-5W1
VQ4401-5W1
VQ4501-5W1
VQ4101R-51
VQ4201R-51
VQ4301R-51
VQ4401R-51
VQ4501R-51
VQ4601R-51
VQ4101R-5W1
VQ4201R-5W1
VQ4301R-5W1
VQ4401R-5W1
VQ4501R-5W1
VQ4601R-5W1