Bissell Solution Mixing Pis...
$6.99
Product details
Inside a Bissell ProHeat's auto-mix system there is a small piston that meters formula into the water stream. Part 2108722 is that piston for the 1698 ProHeat and its relatives.
It is a wear item in a warm, wet environment. As the piston or its seal goes, metering stops being accurate: the machine lays down plain water while the formula tank empties slowly, or it dumps formula and leaves the carpet tacky and quick to re-soil. Dried formula around the piston can jam it outright, in which case the mix control does nothing at either end of its travel.
It fits the ProHeat 1697, 1698 and 1699-1, along with the 7901, 7920 and 8910. Flushing clean water through the system after each use is the single best way to stop the replacement gumming up the same way.









