An apparatus for providing hemostasis within a puncture extending through tissue, comprising: an elongate member comprising proximal and distal ends (14, 16) defining a longitudinal axis therebetween, and a lumen extending between the proximal and distal ends (14, 16); an expandable member carried on the distal end of the elongate member; a housing on the proximal end of the elongate member, the housing including an interior communicating with the lumen of the elongate member; a pressure indicator on the housing for providing feedback indicating that sufficient fluid has been delivered into the interior to expand the expandable member to a predetermined expanded condition; and a piston slidable within the housing interior from a first position to a second position as fluid is delivered into the interior of the housing, wherein the pressure indicator is coupled to the piston, the apparatus further characterized by: the pressure indicator further comprising a shaft or member that projects from the piston outwardly from a proximal end of the housing, the shaft or member carrying a visual indicator that provides a visual indication that a predetermined pressure and/or volume of fluid has been introduced into the housing to expand the expandable member to the predetermined expanded condition; and a pressure relief mechanism allowing fluid to escape from the interior of the housing when a predetermined pressure is exceeded, the pressure relief mechanism comprising an evacuation port that communicates with the housing interior when the piston is at or proximal of a predetermined position to thereby prevent overexpansion of the expandable member. an elongate member comprising proximal and distal ends (14, 16) defining a longitudinal axis therebetween, and a lumen extending between the proximal and distal ends (14, 16); an expandable member carried on the distal end of the elongate member; a housing on the proximal end of the elongate member, the housing including an interior communicating with the lumen of the elongate member; a pressure indicator on the housing for providing feedback indicating that sufficient fluid has been delivered into the interior to expand the expandable member to a predetermined expanded condition; and a piston slidable within the housing interior from a first position to a second position as fluid is delivered into the interior of the housing, wherein the pressure indicator is coupled to the piston, the apparatus further characterized by: the pressure indicator further comprising a shaft or member that projects from the piston outwardly from a proximal end of the housing, the shaft or member carrying a visual indicator that provides a visual indication that a predetermined pressure and/or volume of fluid has been introduced into the housing to expand the expandable member to the predetermined expanded condition; and a pressure relief mechanism allowing fluid to escape from the interior of the housing when a predetermined pressure is exceeded, the pressure relief mechanism comprising an evacuation port that communicates with the housing interior when the piston is at or proximal of a predetermined position to thereby prevent overexpansion of the expandable member. the pressure indicator further comprising a shaft or member that projects from the piston outwardly from a proximal end of the housing, the shaft or member carrying a visual indicator that provides a visual indication that a predetermined pressure and/or volume of fluid has been introduced into the housing to expand the expandable member to the predetermined expanded condition; and a pressure relief mechanism allowing fluid to escape from the interior of the housing when a predetermined pressure is exceeded, the pressure relief mechanism comprising an evacuation port that communicates with the housing interior when the piston is at or proximal of a predetermined position to thereby prevent overexpansion of the expandable member.