My plumbing is already 1" for the drain line and emergency line but I bought a new aquarium, custom made and I accidently told the guy I wanted 1 1/5" Holes for the drains.... Now I have to go with 3/4 bulkhead and then use a reducer to open back up to an inch... Unless someone knows where I can find 1" bulkhead that fit a 1 1/5" hole ....