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If you use 385 pit spacing, if you use 400, you must measure accurately, which is the distance from the center of the sewage outlet to the wall. The walls should be straight, and the toilet should not be flushed, but siphoned. The siphon pipe is about 5CM, so that there is 2CM plus or minus, be careful when installing, you can't use the flange ring, you should be aligned, and play more glass glue.
There is a brand with a 350 toilet is the best, and Wrigley AB1218 has a 350 pit distance.
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Normal toilets are reserved for two empty! 300 vs 400! You'd better choose 400 out of water!
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380's, that's the standard size.
Toilet pit distance of 350 needs to buy a toilet with pit spacing of 300. The toilet can choose to be smaller than the ground pit distance, if the toilet is larger than the ground pit spacing, it will not be installed. >>>More
How to measure the distance between the toilet pits.
You can buy a normal toilet, as long as you fancy the style and price of this toilet, as for his 400-ton pit, tell him when you buy it, if this is a hundred pits, he will recommend it to you.
Use as big as you need, the good toilet has three pit openings, and the bad one has two.