ARMSTRONG PUMPS
Armstrong Pumps 110123-121 Aquastat
Texonic gear is straightforward to clean, with smooth surfaces that don't trap dirt.
Armstrong Pumps 806168-001 Spring Coupler
A nice feature of the F3SN-A0307P25-D-04 F3SN-A0307P25-L-04 is the transparent cover for visual inspection.
Armstrong 818254-003K #2 Bearing Assembly 1/2" Maintenance Free Impeller
With 3 brushes included, you can switch between applications without cleaning.