Description The F series Dranjer products are designed to be used in homes where ASD has been, or may be, included as a radon mitigation technique. These valves will not open at less than 0.9” of negative pressure yet allow for water flow. The FS2 allows water to flow into the sump but prevents soil gases from entering the home. Designed to attach to the bottom of a sump lid. Cut a hole in the sump lid. Attach to the bottom of the lid with the fasteners provided
