Abstract: The present invention provides a device that can be used with in-line chlorinating systems for pools and will allow visual indication of the amount of chlorine or other chemicals that remain in the in-line chlorinating system without having to remove the cap or cover of the reservoir. The device is unique because it is maintenance free and relies on gravity and no other force to work.

Abstract: An expandable transformer housing having a first housing member with a hollow cavity therein, a second housing member with a hollow cavity therein, and at least one exterior insert member therebetween in a stacked formation. The exterior insert member has a first end and a second end. A portion of the first end of the exterior insert member is adapted to engage the first housing member and a portion of the second end of the insert member is adapted to engage the second housing member. An interior insert member is also provided having a first end and a second end. A portion of the first end of the interior insert member is similarly adapted to engage the first housing member and a portion of the second end of the interior insert member is adapted to engage the second housing member. The interior insert provides insulation between the current source and the second windings of the transformer.