On Mon, 19 Mar 2007 19:23:20 -0400, "Jack" wrote:

Hello,
My house is 4 years old. I bought it new. Three bathrooms, 2 on second
floor, 1 on first floor.
.
The toilet on the first floor doesn't flush that well. I don't know if the

BTW, did it used to flush well?

reason is because of venting, or if the reason is because its a 'builders'
fixture (Mansfield is the brand).
.
Would replacing this fixture with a high-grade model from Toto make a big
difference?

Not if the problem is venting.