A novel probe housing assembly comprises a body, a cap, and a retainer. The retainer is adapted to releasably engage the body and the cap wherein, a second edge of the cap abuts a first edge of the body, and a third threaded portion of the retainer engages, by five complete revolutions, a second threaded portion of the cap, and a third threaded portion of the retainer engages, by five complete revolutions, the first threaded portion of the body whereby the cap is releasably secured to the body by the retainer thus achieving an EX-D compliant seal.
