"Jaswell-type seal" means a flexible rubber like collar with circular rings designed to provide a water tight seal between the well casing and a larger diameter hole. The term includes such seals manufactured by the Jaswell Corporation, and any similar products of other manufacturers.
N.H. Admin. Code § We 101.21
#6448, eff 1-29-97; ss by #7306, eff 6-13-00; ss by #9177, eff 6-13-08 (from We 101.20 )