Smith and Low have been here for eternity, and always have the thing that nobody else stocks. Great shop with very helpful and knowledgeable staff. Don't know what I do if they ever closed, which I hope they never do.
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Provides automatic temperature control of domestic wet central heating systems. Used either as a direct switch for circulating pumps and boilers or to operate spring return and motor open/motor close zone valves. Features dual-diaphragm temperature sensing element.