Sapphire Scientific Dri Eaz Big Gulp 3500 Vacuum pump designed for many application like water extraction during flooding (with external tank) or just to create vacuum or negative pressure up to 500CFM! Runs on gasoline then completely autonomous. Perfect for mobile units. 993cc Briggs & Stratton (Vangard) 24 HP engine. Garden Denver Triflow 408 Tri-Lob Vacuum Positive Displacement Blower at 13 In. Hg. Only 60 and 100 hours of use. Works well and very efficient. VALUE OF US$16,000 Price only $4995 each.