By December 31, 2020 nurse tank withdrawal valves shall be protected by an excess flow valve matched to the designed flow rate. Flow capacity of the excess flow valves shall not exceed 45 GPM for 1¼” connections & 60 GPM for 1½” connections.  Each valve shall be removed from service & inspected at an interval not to exceed 5 years. In Illinois alone, we have over 28,000 nurse tanks, so replacing these valves to the appropriate sized GPM will take time. If you haven't already done so, please put this on your to do list. The valve manufacturers have a good inventory of withdrawal valves in stock, however waiting to order the last minute could result in a delay in receiving the valves.