[folivier]

And if you're in a situation where you can't wait for parts to rebuild that valve you can always go to a hardware store and get an ice maker valve (those are usually with 1/4" ferrule fittings) and use that to stop the leak.
And in your spare parts kit you should have an assortment of air tubing and fittings so you can repair a leak as this.
But I think you have other leaks than this, but start with this and keep going.