&Acy rectal drainage appliance (10) is disclosed. The appliance has &acy tubular element (12) defining &acy drain passage with an inflatable balloon (20) at &acy distal end for insertion into the rectum. An auxiliary lumen (24) communicates with the inflatable balloon (20) and is coupled to a pressure indicator (34) for indicating &acy pressure level within the balloon (20). The pressure indicator (34) comprises &acy first mechanical element (36) configured to flip between first and second physical states depending on the sensed pressure.
