If it's a flexible coupling into the boiler it usually has a screw fit which is hand tight.
I understand that it should normally be disconnected after charging the system anyway. (if it's the coupling I am thinking of)
Samsung Galaxy S8 review
1995-2015: How technology has changed the world in 20 years
This poetic animation about monsters is illustrated in a Van Gogh painterly style
How to get WWDC 2017 tickets
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.