Dranjer F-R2

The Dranjer F-R2 is a special-designed floor drain valve which lets liquid drain, but prevents gases (radon, odours) and bugs from coming up. F-R2 is suitable for installation alongside a sub-slab depressurization system drawing up to 1.25 inches of water column (measured at the drain). We use this product in older homes with floor drains 8 inches or less in diameter.