Outer housing with a sidewall shell and cap attached thereto for a pressure monitoring system

An outer housing for a pressure monitoring system comprising:

• a sidewall shell defining an outer shell surface and a top end, the sidewall shell comprising an annular outer sidewall projection extending from the top end, the outer sidewall projection defining at least a portion of the outer shell surface;
• and
• a cap mounted to the sidewall shell, the cap defining an inner cap surface and an annular outer cap surface opposite the inner cap surface, the outer sidewall projection extending alongside an outermost portion of the outer cap surface;
• wherein the outer cap surface defines a cap curved portion and the outer sidewall projection defines a projection curved portion meeting the cap curved portion, such that the cap is substantially flush with the sidewall shell, and
• wherein the outermost portion of the outer cap surface is positioned radially-inward of the outer sidewall projection.