This first field photo is a level sensor junction box with a seal-off (far right) correctly placed between the junction box and the electrical control panel to help protect the vital and often expensive components in that control panel from corrosive and explosive vapors.

The two seal-offs installed on the left conduits between the junction box and riser may protect the less costly junction box but will make it very difficult to remove the level sensors for servicing.

The leads will need to be cut below the seal-offs, not to mention, the seal offs and length of conduit will need to be replaced. If the sensors still function their leads may now be too short.

In addition, and perhaps more importantly, these junction boxes will not be able to compensate for pressure or vacuum in the sump as intended, resulting in inaccurate level readings.

This second photo is a motor lead junction box with a seal-off (far left) correctly placed on the conduit between the junction box and the electrical control panel to help protect the vital and often expensive components in that control panel from corrosive and explosive vapors.

The two seal-offs installed on the right conduits between the junction box and riser may protect the less costly junction box but will make the process of pulling the pumps for service cumbersome.

The motor leads will need to be cut below the seal-offs, not to mention, the seal offs and length of conduit will need to be replaced. This could result in the motor lead lengths being too short when reinstalling.