Wisy Riser Extension (WFF100/150)

Vortex Filter Extension.The WISY Vortex Filter is designed to be installed below ground or above ground. If the WISY Vortex Filter is installed below ground, the WISY extension tube is necessary to bring the filter lid to grade.
The extension tube for the WISY WFF100 and WFF150 are 24" in length. The maximum extension for the WFF100 and WFF150 filter is 3 extensions or six feet. Any deeper installations require the filter to be placed in a vault based on the manufacturer's installation instructions.