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We recommend uHeat for Underfloor Heating Systems, and The Wetroom Store for all things bathrooms and wetrooms. They provide discounts for forum members.
Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws
The end with the h a or c unscrews via the knurling
Hand or you can grip the knurl with some pliers / grips be warned this may damage the chrome etc
We recommend City Plumbing Supplies, BES, and Plumbing Superstore for all plumbing supplies.