It's this one from eBay, 50mm bore 45 mm stroke. Modified like Chris suggests by drilling port holes bigger and had to drill and tap an exhaust port at the bottom to vent it after it's fired.
http://m.ebay.co.uk/itm?itemId=190837115480
Why not use a QEV? (Quick Exhaust Valve)Originally Posted by ChrisKazoo
I have a QEV on the inlet and have pondered whether having a QEV on the exhaust would be worthwhile but I would still have to drill and tap a port for it as it's a double acting ram so normally would be vented by putting gas in the top port and exhausting through the bottom port back through the solenoid valve. Without a new port drilled the ram fires and then the gas has nowhere to go to vent.
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