Comparison : Item # B3177-52, Reservoir with Filter and Low Level Safety Switch, 1 qt Pyrex Reservoir, 3/8” Male NPT
Item # B3177-53, Reservoir with Filter and Low Level Safety Switch, 1 qt Pyrex Reservoir, 1/2” Male NPT
Item # B3177-63, Reservoir with Filter and Low Level Safety Switch, 1 qt Pyrex Reservoir, 5/8"-18 Thread for Remote Mounting, 1/8” Female NPT Outlet
Item # B3177-57, Reservoir with Filter and Low Level Safety Switch, 1/2 gal Pyrex Reservoir, 1/2” Male NPT
Item # B3177-64, Reservoir with Filter and Low Level Safety Switch, 1/2 gal Pyrex Reservoir, 5/8"-18 Thread for Remote Mounting, 1/8” Female NPT Outlet