Abstract: A fluid-tight shaft mounting for rotatably and fluid-tightly supporting a shaft member having one end rigidly mounted with a driven element, for example, a pump impeller, which mounting comprises a generally tubular housing through which the shaft member extends, a sealed bearing assembly positioned within the housing and exteriorly around the shaft member for the support of the shaft member relative to the housing, and an axial-mechanical face seal assembly interposed between the driven element and the sealed bearing assembly and exteriorly around the shaft member. The housing has at least one passage defined therein for communicating an annular space between the bearing assembly and the face seal assembly, with the outside of the housing. It also comprises an annular partition member disposed around the shaft within the annular space, dividing the annular space into a pair of annular chambers that are communicated with the passage in the housing.