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The valve on the pipe with the red line on the right is hot water, and the two sides on the left are cold water valves, just use one.
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In fact, one of the two valves on the left is sufficient.
Ask the property or the developer. This should be used for water supply and water heaters.
The bathroom has three valves with a wash basin, toilet seat and shower.
Solar power in the master bedroom and gas valve in the kitchen.
The oblique tee is to drain more smoothly, if it is a right angle, the impact of the water flow is great, and the oblique tee flows in the direction of the water flow, which will naturally be much smoother.
The rubber O-ring on the spool of the solar water valve has been scalded by hot water for a long time, and it needs to be replaced, but it is too old and not easy to match the same.