With dusty conditions there is only one way to guarantee that pulsators get the clean air that enables them to function at peak efficiency. Fresh Air Filter fits up to 3" PVC pipe and features a one-piece, durable plastic cover. Use with a standard automotive-type filter. Adapter kits are available for Bou-Matic, Surge, Westfalia and Strangko. Includes 2 each nipple adapter, black transflow hose, and 90 degree elbow.