Interested in getting a Value Series spa retrofit kit, but looking for a little more features than value? If so, the VS501Z is the Balboa retrofit kit for you. The VS501Z kit brings you a few more of the cutting edge spa features that Balboa has become known for, without breaking the bank. All VS systems have a plastic enclosure to eliminate corrosion and suppress water intrusion. Also, VS series connectors are built onto the circuit board itself to minimize clutter and simplify potential future service. The Value Pack is meant to be installed by a spa professional, so you can rest easy, knowing he's working with a product known for reliability, ease of installation, and serviceability.