"Swivel adaptor" means a device mounted on the fill riser pipe and vapor return riser of a gasoline storage tank that prevents loosening or over-tightening of the adaptor by means of a swivel-type mechanism.
N.H. Admin. Code § Env-Or 502.29
(See Revision Note #1 and Revision Note #2 at chapter heading for Env-Or 500) #10229, eff 11-17-12