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Von Duprin NL Drive Screw 090074

The 090074 NL Drive Screw is used on the Von Duprin 22, 98 and 99 Exit Devices to control the rotation of the key cylinder cam. This small set screw, screws into the back of the chassis assembly next to the receptor for the Rim Key Cylinder. The set screw measures 5/16" long by 3/16" diameter. Note: When the NL drive screw is left in back of device, the outside cylinder will function only as a Night Latch. The Night Latch function means the door can only be opened, but not dogged open with the key cylinder.

Von Duprin Part # 090074
Old Von Duprin Part # 970441

The Von Duprin 990DT Trim is known as a Dummy Trim.  This plate mounts on the exterior of the door, and the welded on mounting studs line up with the 99 device on the interior of the building.  If you have a different manufacture or a different Von Duprin series on the interior, it will not line up.  On the back of this plate we usually find the number 990 stamped on it.  The plate shown here is for the Rim and Surface Vertical Rod 99 and 98 devices.  If you have a Mortise or Concealed Vertical Rod, call us and we will order that model.  The plate measures 3" wide by 14-3/16" tall.  Order here for the 990DT-R&V.