A mechanical seal assembly adapted for arrangement around a rotating shaft of a rotating device and has first and a second seal rings. The assembly also includes an annular carrier having a base and a removable end portion configured to be affixed to a housing of the rotating device. The assembly also includes an annular flexible sealing membrane. The membrane includes an outer portion arrangeable between the first seal ring and a biasing mechanism and that is axially shiftable relative to the rotating shaft. The membrane also includes an inner portion surrounded by the outer portion and positioned between the base and the removable end portion of the annular carrier and the base and a removable end portions hold the inner portion in fixed relative to the annular carrier as the outer portion shifts relative to the rotating shaft.