How to use a water level<br>Use 50 to 100 feet (15 to 30 m) of tubing with a 5.16 in (13. 1 cm) diameter. A water level is easy to make at home with plastic tubing and a few other supplies. If you plan to level items that are a far distance from each other, you may opt for a longer tube.
The tubing diameter must be 5.16 in
There is no specification as to why that diameter would need to be chosen. Other diameters should theoretically work just as longer tubing can work.
( z1 obligate :ARG2 ( z2 equal :ARG1 ( z3 diameter :mod ( z4 tubing ) ) :ARG2 ( z5 distance-quantity :quant "5.16" :unit ( z6 inch ) ) ) )