DEFINITIONS:

these valves are designed to use air, filtered with a 40 micron filter.  They can be used with air, nitrogen, CO2 and low viscosity fluids like water and some light oils that are compatible with viton O-rings.  

a 2-Way valve is ON-OFF, has an inlet  and outlet port and is usually used for aquariums, air for CNC applications.  A 3-way valve can be modified to be a 2 way valve by plugging the exhaust port.

A 3-way valve is usually used to control single acting pneumatic cylinders.  It has an inlet port, a port to the cylinder and an exhaust port to discharge the air from the returning piston.  These are usually "normal closed" but can be modified to be normal open, which I use for drag racing "throttle stop" controls.  

Solenoid coils come in several voltages.  I have both 12VDC and 110VAC available

These valve have 1/8" pipe size ports.  They come in 1/8" BSP and 1/8" NPT pipe thread sizes.  BSP stands for British Standard Pipe, and NPT stands for National Pipe Thread .  BSP is common in British Commonwealth countries and NPT  is standard in the US.. They are basically the same size but the thread form is different enough that the fittings are not interchangeable.  BSP can be converted to NPT with a special tap.  

The solenoid valves in this listing are "AIRTAC" Brand manufactured in China.  Lately, they have been shipping me the same valves under the "AiGYAD" label.  They come with 1/8" BSP ports and various solenoid voltages.  I stock parts to configure each solenoid to your requirements.  Each valve is assembled to order and bench tested before shipment.  

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