Traditional Point DrainsA regular or traditional drain goes by many names. I've heard it referred to as a point drain, a clamping ring drain, a grate drains, a standard drains and on and on.Many plumbing and building codes require certain drain line sizes, and sometimes even the quantity of shower drains in a single or gang shower. When in doubt, it is always better to have a larger drain instead of one barely able to keep up with the shower's flow rate.Tip: If you have two thermostatic control valves, as in this shower, plan to use a higher-flow-rate drain. You can work out actual flow rates by calculating the capacity of the fixture with the pressure and size of the water lines. Do not leave this to chance — it's worth it to do the math!