Viking now offers straight-through deluge and flow control valves in 4", 6" and 8" nominal sizes. UL listed and FM approved, Viking's new valves feature grooved inlets and outlets. They are compatible with Viking's EZ or Conventional trim and can be installed vertically or horizontally. They can be retrofitted into existing straight-through systems, and like all Viking Deluge Valves, are resistant to problems caused by pressure surges.Viking Corp.