The OPW 7H-0400-NUL diesel nozzle is intended for Heavy-Duty, High-Flow Truck, Bus and Fleet Service. If you operate a full-service truck stop, refuel your own fleet or manage a card-lock refueling location, the low-cost, long-life and durability of the OPW 7H-NUL high-flow nozzle can help increase your productivity, sales and profits. This nozzle comes with hold-open clip so does not comply with NFPA Code 30A. Warning: Do not use OPW 7H-NUL nozzles with a hold-open device on pre-pay self-service installations. Use the OPW 7HB or the 7H without a hold-open device. Failure to comply is a violation of NFPA Code 30A, and may create a hazardous condition. Use of foreign objects to hold open automatic nozzles could result in shut-off failure and personal injury. NUL stands for non UL nozzle