43080 – Diaphragm Plate, 5521, Lower, Replaces part 1075355

The AqMatic 43080 is a lower diaphragm plate for 5521-series diaphragm valve assemblies, used in water treatment, filtration, and industrial flow control systems. It is a direct replacement for part 1075355, designed to restore proper diaphragm support and valve operation.

This component sits beneath the diaphragm and works as a structural backing plate, helping maintain correct diaphragm shape, lift, and sealing performance during valve cycling. In diaphragm valve systems, the plate plays a critical role in translating control pressure into consistent valve movement.

The 5521 configuration is used across specific AqMatic valve assemblies and internal kits, so this part must be matched exactly to the valve model and internal configuration. It is typically replaced during rebuilds when wear, deformation, or corrosion affects diaphragm support.

This part is commonly serviced alongside diaphragm kits and internal components in systems that may also include V42 diaphragm valves, K53 series valves, and control systems using stagers.