300,400 double-hole toilets?

I'm chaozhou people. I make toilets. This kind of toilet is a double-hole toilet, and there are two blowdown holes at the bottom of the toilet, usually 300 and 400 pits, so it is easier for manufacturers to go to stock when producing and selling. But to be honest, although the national standard allows the use of double holes, it is necessary to repair an unused hole with a plastic cover and plastic soil before leaving the factory, so the quality is not as good as that of a single-hole toilet. I sold it online myself.