Push fit join will have a circular overlap on it which when pushed down hard
will release the fitting so you can slide off..I will stress that it takes some
getting use to.
Biggest mistake with push fit is always bad installation otherwise very
good...as we use push fit to seal off copper work when testing.As we test at
5bar and normal mains pressure around 1.5-2bar you can work out the maths
yourself. When connecting push fit always make sure the fitting doudle clicks
into position as one click will lead to leaks.