Veeco Brass Vacuum ValveCondition:* Surplus Item. Unable To Test. As Pictured.Additional Notes:* Model Unknown, And Unable To Determine* Both Flanged Openings Are 1-1/2″ Inner Diameter* Threaded Fastener Opening Is 1/2″ Inner Diameter* Screw Holes on The Smaller Flange Are 1/4″ Diameter* Screw Holes on The Larger Flange Are 7/8″ DiameterUNKRP22714