It's a gerber floor mounted with sloan valve and 1.6 gallons of water consumption. I have an 8'' rough in. The old toilet had a top spud and this new one has a back spud. From the old valve, I only added an extension of about 6'' pipe to connect to the back spud. When I flush, it seems like 4-5 times of water is coming out before it stops. I hope this helps. Thanks.