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Most of them are fixed with angle steel, punched holes on the angle steel, and clamped with garden steel hoops
The main tube is at least DN65 (2 inch half tube), and then transferred to the tube with DN32 (1 inch 2 tube) on each squatting toilet through tee.
There is no such rule, and it is not realistic.
Labor costs are based on local conditions, such as first-tier cities are definitely more expensive than second-, third, fourth- and fifth-tier cities, so you can find a few more to compare, and shop around for groceries!
This is suitable for use, and generally speaking, the operating height is more suitable for the user's chest.
It's best not to, it's easy to leave dirt on the stage, it's not good for hygiene, and the second is easy to cause wrestling.