- Hand held, siphon spot blaster is ideal for those small touch-up jobs. Removes rust and paint without damaging or marking the underlying surface. One pound of abrasive is included. Nozzle size: 5/16in steel. Air jet: 5/32in. Air pressure: 80-125 PSI. Minimum air volume: 7-20 CFM. Blast time: Unlimited. Container size: 1 lb. Shipping weight: 3 lbs. Air inlet: 1/4in NPTF.