Generac - PRECLEANER:AIR GTH990 GASOLINE HEAVY-DUTY CONSTRUCTION - Originally manufactured with carefully selected heavy-duty and high-grade materials to offer maximized durability over time. OFFERS MAXIMUM ENGINE PROTECTION - Prevents dirt and contaminants from entering your engine. It protects your engines from dust, pollen, dirt and other pollutants, keeping your RV in full performance. PRE-CLEANER REPLACEMENT PART - This Generac air filter part is made compatible with GTH990 Generac engines and fits D9723 air filters. ORIGINAL EQUIPMENT MANUFACTURER - This pre-cleaner is a guaranteed OEM part designed to deliver you with a reliable and high-performing product. SUPPLIES AND PARTS FOR MOTORHOMES - This item is an original product of Generac Group. A full line of Generac accessories and replacement parts are also available.