Inline or side port connections are a way to plumb a pneumatic valve. All connections are made to the valve through ports available in the main body or auxiliary components. When changing out a valve, all connections will need to be reconnected to the new valve. Port sizes are 1/4" NPTF, 3/8" NPTF, 1/2" NPTF, 3/4" NPTF, 1" NPTF and 1-1/2" NPTF. We have provided custom BSPP, BSPT and various other port fittings, current or old fashion. Please consult factory for options.