Kent KVCRP Pop Up Drain - Double Contained / Dual Skin Kent KVCRP Pop Up Drain - Double Contained / Dual Skin Kent Kent KVCRP Pop Up Drain - Double Contained / Dual Skin This is a Dual Skin, Twin Walled or Double Contained version of our KVCRP Pneumatic Floor Gully. The pneumatic connection is accessed from inside the drain body. A flange supplied by Kent is mechanically connected to the inward air pipe. A second flange is connected to the internal air pipe and these come together to form a double flange/gasket connection. There are 3 options for the pneumatic valve choice: Single Acting Sprung Out Cylinder Air supply required to close the drain and exhausted to allow the cover to open using an internal spring. This system is generally used when the drains are connected to the fire suppression system. In the event of the air supply system failing the covers will open. Single Acting Sprung In Cylinder Air supply required to open the drain and exhausted to allow the cover to close using an internal spring. This system is generally used in clean production areas. In the event of the air supply system failing the covers will remain sealed. Double Acting Cylinder Air supply is required to both open and close the drain, this system is generally used when drains are to be opened for cleaning / wash down cycles. Constant air supply required to keep the cover sealed. INDUSTRIES - BioPharma - Pharmaceutical - Laboratories t it Opening Options Sprung Out - Sprung In - Double Action 1.57” (40mm) clear opening under cover Product Code Bottom Outlet With P Bend Trap