"Clean-up" the fire-wall penetration (both sides of wall) ensuring not to nick the cable jacket (s).  (use a slotted coupling to mark Sleeves hole size). Work the bottom half of the Split Sleeve under the cables as you insert it into the wall penetration. Support the cable (s) as the upper half of split sleeve is inserted through the fire wall. Install top half, maintaining sleeve polarity. Look for machine or paint marks on end of  the Split Sleeve halves to insure the halves are installed as machined.

Work cables through the slot of the 1st washer, work the washer over the sleeve halves and against the wall. (If your hole is not the size of the sleeve, apply a 3/8 bead of  firestop caulk behind the first washer on each side of the wall.) Install the 2nd square washer for the first side and invert the slot so the slots in the washers are 180 degrees from each other. Work the cables through the slot in the first coupling and begin to screw it down the sleeve until equal lengths protrude on both sides wall. Install the split bushing if there is a chance that more cables will be pulled in the future.

Repeat the above procedure for the other side of the Sleeve system.  Tighten the slotted couplings only enough to seat the square washers. Do not over or under tighten the slotted couplings.