New Martonair (now Norgren) 1/8" NPT Manual Push Button, Poppet Type Pneumatic Valves, Normally Closed Operation, with Shrouded Silver Pushbutton and Mounting Nut, Part Number S/666/51/S (S/666/51/Silver).  Each bid quantity is for One (1) Valve.  You may bid / buy any number, up to the total quantity available above.

These were purchased at an online liquidation recently, and they are new in the original factory boxes.  Some boxes are worn, best boxes will ship first.  We also found a couple of loose nameplates while we were inspecting them, so there is a possibility that a few may need to be re-glued after shipment.  Operation is Normally Closed.  That is to say, air flows through the valve only when the button is pushed.  Rugged shrouded button design helps prevent accidental operation.  For use with filtered air at pressures from 2 to 10 BAR (29 to 145 PSI); from either lubricated or non-lubricated systems.

Pricey little gadgets when you buy them from a retail supplier.

According to the calipers:

Overall length:  3.129" / 79.49 MM

Width:  1.322" / 33.59 MM

Thickness:  .759" / 19.27 MM

Mounting hole diameter:  1.141" / 29 MM

Body material: Die Cast Zinc Alloy

Seals: Nitrile

Piston: Plastic