Comparison : Item # B3540-11300BA1W, Standard Aluminum Liquid Level Gage, 13” Centerline, Front Mount 1/2"-20
Item # B3540-11300BB1W, Standard Aluminum Liquid Level Gage, 13” Centerline, Back Mount 1/2"-20 with Nuts
Item # B3540-11300BA2W, Standard Aluminum Liquid Level Gage, 13” Centerline, Front Mount 1/2"-13
Item # B3540-11300BM1W, Standard Aluminum Liquid Level Gage, 13” Centerline, Front Mount M12 X 1.75
Item # B3540-11300BN1W, Standard Aluminum Liquid Level Gage, 13” Centerline, 1/4" Male NPT Adapters