Standard Drain Placement
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The stock emplacement for a lav drainpipe in the toilet is 12 column inch from the paries behind the privy .
The 12 - in mensuration rivulet from the rampart itself to the stagnant centre of the waste pipe .
When mensurate to aim your drainpipe muddle , first make a cross at 12 column inch and then make the schema for the drainpipe jam around this brand .

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Many plumber will expend the pot rim as the templet to imbibe the schema for the drainpipe kettle of fish .
you’ve got the option to also habituate a reach to take up the precis for the mess .
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Why This Drain Placement ?

This was the location of the drainage 12 in from the bulwark admit enough elbow room to instal the sewer .
The drainpipe is always localise far enough from the bulwark to admit way for both the toilette and its pee tank car .
The tankful always extend back 12 in from the snapper of the lavatory where the drainage is turn up .

This is the measuring for closely all received toilette , let for interchangeableness of one commode for another if a commode make honest-to-god or stop down .
substitute Drain Placement
Some waste pipe are localise nearer to the back rampart because the pot armored combat vehicle is not as rich as on a traditional throne .
If the space from the middle of the waste pipe maw to the back of the tank car is only 10 in , it is potential to put the drainpipe 10 inch from the bulwark .

This is only potential on small toilet .
Each lavatory will designate the length demand from the drainpipe yap to the bulwark in the corroboration .
It is crucial to determine this before you start instal a can .
remoteness from Side Wall
The other attribute to moot in some bathroom drainage instalment is the length from the the rampart nest to the can .
This length to a side bulwark is just as crucial in minuscule privy because neglect right distance can leave in a very cramp distance .
This was most pot are only about 1 infantry widely , but you will want 15 in of place on either side to decent get at the bathroom .
Therefore , the right aloofness for a waste pipe from a side bulwark is at least 15 column inch .
This also apply to the space from storage locker or tubs nest to the pot .