The Water Feed Float Switch is designed to signal a valve to open so water is added when the water level in the RainXchange storage basin is low. Should be located in the bottom portion of your snorkel vault. This switch requires an irrigation valve, plumbing and a transformer.

Manufacturer's Description
Specially designed doser-style float switch signals an irrigation valve to open and add tap water during low water levels in the RainXchangeí storage basin. Located in the lower portion of the Snorkel Vault. Requires irrigation valve, transformer and plumbing.