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Hawk Heating Supplies is one of the few small-big independent plumbing and heating merchants based in Harrow, London that pretty much stock everything related to plumging and heating. The list of products is far too long and diverse to mention here but some of the few out of the list are: 

Boiler Spares (We are specialists in Vaillant spares) 
Unvented Spares 
Gas Fittings 
Gas Spares 
Commercial Gas Fittings 
Gas Meters 
Shower Spares 
Shower Thermostatic Cartridges 
Toilet / WC Spares