Water Pump
From Amazon
Magnaclean System Cleaner, Black, 22 mm
Wickes
Adey PRO2 MagnaClean Central Heating System Magnetic Filter - 22mm
Bathrooms and Showers Direct
Adey MagnaClean Professional2 CP1-03-00022 22mm Magnetic Filter Black
Travis Perkins
ADEY MagnaClean Professional Filter 22mm