Based on our and our customer's experience, Backwoods compiled a set of commonly needed field service kits for the Aquatec SWP-4000.
A decrease over time in the volume of water being delivered is a likely indicator that there is wear on the valves and diaphragm in the pump head.
This kit includes the diaphragm and wobble bearing. The Lower Housing Assembly(LHA) is one of two kits that are commonly purchased together. Typically the Valve Housing Assembly(VHA) containing the valves/housing as well as two small outlet flaps will be purchased and replaced at the same time.