Universal Military Electrical Box Wrench 88-21146, NSN 5120-01-373-8976, Onan 0420-0619 Published March 6, 2018 at 1600 × 1200 in Universal Military Electrical Box Wrench 88-21146, NSN 5120-01-373-8976, Onan 0420-0619 Universal Military Electrical Box Wrench 88-21146, NSN 5120-01-373-8976, Onan 0420-0619 Universal Military Electrical Box Wrench 88-21146, NSN 5120-01-373-8976, Onan 0420-0619