1. A 1/4” threaded input is provided in the handle of the speed vac. A hand tightened air line connection should be sufficient to provide leak free operation. Care should be taken not to over tighten the connection and result in cracking the housing.
2. Dual operation as a blow gun or hand held vacuum is possible by removing and reversing the cylinder located in the barrel of the unit. To remove the cylinder from the barrel section, turn the knurled and threaded rear section of the barrel in a counter clockwise direction and remove it. Pull the cylinder out, along with the O Ring. The arrow on the side of the cylinder indicates the air flow.
3. Return the cylinder with the arrow pointing forward for a blow gun application or with the arrow pointing to the rear for a vacuum operation. Return the O Ring and knurled cap to a hand tightened positiion.

CAUTION:
BEFORE OPERATING THE SPEEDVAC MODEL 90400 IN THE VACUUM MODE, A HOSE OR DUST BAG MUST BE ATTACHED TO THE REAR OF THE UNIT. OPERATORS SHOULD WEAR SAFETY GLASSES WHEN USING THE SPEED VAC.