(100037735) JG ELBOW salt monitor probe is held in place by two 3/4-inch self-tapping screws that engage the Housing flange. An O Ring seals the Salt Monitor Probe and Housing. Place the O-Ring onto the housing end cap, lubricate with silicone grease and then using a twisting action, insert the Salt Monitor Probe into the housing. Caution: The 3/8-inch locking clip must be installed to prevent air from being drawn into the appliance during brine rinse.