I can snap it on, and I know how to cement PVC, but I don’t know how I would cut out the pipe where the fitting snaps on.
Have you ever done this? Have you ever seen it done?
I saw a reference to ‘drilling with a diamond drill’, but I’m fairly sure they were talking about adding a snap-on to a ceramic / vitrified clay pipe. I just want to snap on to a 90 mm PVC pipe
*random observation: I can get a T junction in 100mm, or a snap-on for 90mm. Evidently our standards process differentiates 90mm as being the stormwater size.
You should be able to glue the fitting on to your existing pipe, then use the opening in the tee as a guide for a hole saw (attached to a drill) of the appropriate diameter to cut out an opening in the existing pipe. This would likely produce the best result.
If you can’t find a hole saw with the right diameter, maybe use a Dremel-type tool with a sideways cutting drill bit instead, but this would likely produce a rougher cut opening.
With that said, most plumbers would likely not use this part, but would instead simply cut the existing pipe and glue a tee in place.
I’m not familiar with that part however it looks like you could just use a hacksaw to cut a v to match the fitting. If you need a round hole then a twenty dollar hole saw kit is fine for PVC or wood.
Ok, a hole saw looks reasonable – I’ll have to measure and see what I can buy, because Holman doesn’t seem to have any installation guides that I can find, and I don’t have any 70-90mm bits. (Also, the stores are closed for quarantine, and I have to buy sight-unseen).
The stormwater drain that I want to tap into is buried, so adding a T junction would involve digging a larger hole and also fitting a new piece of pipe to get a gap and an end I could slip onto. That’s required for pressure fittings, but I hope the hole saw will be less work.
When I dug down, I found the 90 mm pipe inside a 100mm pipe! I was just a foot or two from the nearest downpipe, so maybe they used a 100 T and some 100mm pipe and slipped in onto the 90mm pipe somehow – it’s storm water, so it doesn’t even really have to be sealed.
The pipe seems to be partly blocked at the next downpipe. I’m going to dig another hole and have a look.
When drilling on a PVC pipe, you need to either drill a hole rather smaller than the pipe, or have a very deep hole saw. a 99mm hole in a 100mm has to be 50mm deep, because that’s the radius of the pipe. If the hole saw isn’t that deep, it’ll bottom out. ALSO, for the last 10~20 mm, you’ll be cutting tangentially through PVC. I didn’t try to cut a 100mm hole, but I had to cut out a smaller hole first, to get a little more depth, and I still had to break out some of the pipe I found myself cutting into.