"Balance system" means a type of stage II system which relies on a tight seal between the nozzle and the vehicle fill port which causes the displacement and transfer of vapors from a motor vehicle fuel tank into a gasoline storage tank.
N.H. Admin. Code § Env-Or 502.04
(See Revision Note #1 and Revision Note #2 at chapter heading for Env-Or 500) #10229, eff 11-17-12