Dunbar Plumbing
Master Plumber
On Zurn Air Gaps,
Take a carbide bit and shave the plastic threads completely out on the lower nut.
Then take and push that nut over the threads of the top of the Air Gap, do not force it as it will damage those threads so you will have to try it a couple times till it works. This means you'll have to use that carbide till the nut travels over the threads without distortion.
Most times on granite the thread pattern is too short for the granite. Gauge it by holding the Air Gap up through the hole with at least 3/8" to 1/2" thread reveal so you can install the top. Mark the Air Gap.
Take PVC cleaner and clean the area on the setting you marked, apply glue and slide the nut to that position. Take cleaner and go around both sides of that nut, apply glue after.
Leave it to dry for 15 minutes before using.
That nut will bond to the position you set it. If you don't set that nut right and there is too much reveal of thread up top, use a spacer to lower it down.
That plastic nut bonded quite well without the fear of it coming off. Fixed my problem on dealing with Air Gaps on granite countertops from this point on as well.
Take a carbide bit and shave the plastic threads completely out on the lower nut.
Then take and push that nut over the threads of the top of the Air Gap, do not force it as it will damage those threads so you will have to try it a couple times till it works. This means you'll have to use that carbide till the nut travels over the threads without distortion.
Most times on granite the thread pattern is too short for the granite. Gauge it by holding the Air Gap up through the hole with at least 3/8" to 1/2" thread reveal so you can install the top. Mark the Air Gap.
Take PVC cleaner and clean the area on the setting you marked, apply glue and slide the nut to that position. Take cleaner and go around both sides of that nut, apply glue after.
Leave it to dry for 15 minutes before using.
That nut will bond to the position you set it. If you don't set that nut right and there is too much reveal of thread up top, use a spacer to lower it down.
That plastic nut bonded quite well without the fear of it coming off. Fixed my problem on dealing with Air Gaps on granite countertops from this point on as well.