Things I liked: Size is perfect for the R-10.
Things I would have changed: Include a couple of O-rings with bottle.
What others should know: Mine did not come with an O-ring as shown.
Things I liked: Compact size.
Things I would have changed: Valve doesn't always seal properly. Threads are very sharp.
What others should know: Wrap a couple layers of tape on valve threads when replacing the O-ring.
What kind of adaptors would I need to connect this tank to a Foster fitting for refilling from a hand Pump?
Is there a cap available for purchase that can be screwed to the top of the bottle to protect the valve, o ring and threads from dirt or damage?
We don't carry a cap. You would want to contact the manufacturer for additional assistance.