Often floor drains are installed to drain directly to the soil. The Dranjer F-R2 creates a trap in non-trapped drains.
The “F-Series” Dranjer™ products are designed to be used in homes where sub-slab ventilation has been included as a radon mitigation technique. These valves will not open at less than 1.25” of negative pressure yet allow for water flow.
F-R2 is a retrofit model designed for floor drains.