The Q16 Stainless Steel is the newest addition to Harwil's line of heavy-duty flow switches. This is a direct replacement for paddle style flow switches except it is Stainless Steel so it can be used in potable (drinking water). It is the offspring of the Q-5 SS which will outlast every flow switch (usually over 25 years). The Q-16 and Q-16SS use the same type of mechanism and seals as the Q-5 models. Replace that other brand of flow switch that fails regularly with a Harwil Q-16 in brass or stainless steel.