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2. Double check valve - Wikipedia

   en.wikipedia.org/wiki/Double_check_valve

   A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [ 1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest pressure source.

3. Pittsburgh toilet - Wikipedia

   en.wikipedia.org/wiki/Pittsburgh_toilet

   The most popular explanation for the Pittsburgh toilet is related to Pittsburgh's status as a major industrial city in the 20th century. According to this explanation, toilets such as these were said to be used by steelworkers and miners who, grimy from the day's labor, could use an exterior door to enter the basement directly from outside and use the basement's shower and toilet before ...

4. Basement - Wikipedia

   en.wikipedia.org/wiki/Basement

   Frequently most or all of the basement is used as a recreation room or living room, but it is not uncommon as well to find there (either instead of or alongside the living/recreation room) a guest bedroom or teenager's room, a bathroom, a home office, a home gym, a home theater, a basement bar, a sauna, craft room, play room, kitchenette, and ...

5. Check valve - Wikipedia

   en.wikipedia.org/wiki/Check_valve

   A swing check valve (or tilting disc check valve) is a check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow. The seat opening cross-section may be perpendicular to the centerline between the two ports or at an angle.

6. Bathroom - Wikipedia

   en.wikipedia.org/wiki/Bathroom

   A bathroom is a room in which people wash their bodies or parts of their bodies. It can contain one or more of the following plumbing fixtures: a shower , a bathtub , a bidet , and a sink (also known as a washbasin in the UK).

7. Underfloor heating - Wikipedia

   en.wikipedia.org/wiki/Underfloor_heating

   Underfloor heating and cooling is a form of central heating and cooling that achieves indoor climate control for thermal comfort using hydronic or electrical heating elements embedded in a floor. Heating is achieved by conduction, radiation and convection. Use of underfloor heating dates back to the Neoglacial and Neolithic periods.