New Inner Air Filter Fits Kubota L3600DT L3600DT-GST L3700SU L3710DT/GST/HSTOne New Aftermarket Replacement Inner Air Filter Fits Kubota Compact Tractors, Zero Turn Mowers, and RTVs This inner air filter (safety secondary element) fits inside the outer primary air filter in the dual stage air filtration systems used on Fits Kubota (and many other brands') compact tractors, zero turn mowers, RTVs, and utility vehicles. The inner safety element provides a final barrier to protect the engine if the outer filter is damaged or