Leaking degass bottle

[Chamberpains]

If this is on a KW style split coolant reservoir I simply keep the coolant side cap tight and leave the gas/pressure side loose (about light finger tight) this lets the pressure out of the system and I haven't lost any coolant (or very little) in 3 or 4 months now. I've ran a zero pressure coolant system in all the trucks I've owned with no ill side effects (liner pitting or overheating) that I know of for 12 years and counting.