I could not find a replacement water hose in the local hardware store. So I ended up fixing the old hose by replacing what appeared to be chewed flat o-washer with a brand new O-ring. I picked O-ring because the hardware store did not have flat O-washer with big enough inner diameter.
The hose is not leaking anymore with the O-ring. However, now I am wondering - when one should use beveled O-washer, flat O-washer or O-ring? Can the wrong choice lead to a leak further down the path?