After sleeping on the leaking water /air problem, (See previous post) I reasoned that.as the valve was in too good a condition to be leaking, so it must be coming from the connections. The clear plastic water pipes tend to degrade over time and become hard and brittle. Any attempt to tighten the jubilee clips tends not to work.
Now a bit of heat will re soften the tube and a new connection can be made by chopping off the old deformed end and re- attaching the now virgin pipe end.
Small trick of the trade here. Put a spot of Lubricant on the jubilee clip thread, it will help it tighten up smoothly and easily.
I also removed the hose barb adaptors and refitted with ptfe plumbers tape.
And the result is an airtight and watertight system. 😃👍
4 Kidneys and a Wonky Leg 