Bird,
?You should expect any wye, blastgate or union to accept spiral pipe of same dimension to slip right over. Perhaps a little pushing/twisting, but nothing too tough.?
That being said, I recently expanded, adding a wye and more new spiral pipe. They did not get along. Contacted seller (Blastgateco.com), whom I've dealt with for years, and asked what changed - is there a new sleeve required between these pieces now? Pipe and nipple on wye were precisely the same size.? I manipulated (slit) offending wye to expedite the job. Seller response:
No, nothing's changed, should not need to do this, and refunded me the full purchase price of offending piece.?
So:
1- Expect? spiral pipe to slide reasonably well onto Wyes, Elbows, unions and blastgates. Always has been and currently should be the case - just try to buy all from same source.
2- Contact your vendor if experiencing problems
3- Once properly fit, use a few self-tapping sheet metal screws, and seal with actual duct tape, like Nashua 357, which will stick and stay put. You'll find it at local Hdwe store, sometimes with stove pipe fittings, as it has a high heat rating. Resist temptation to apply silicone or other sealants, or you'll regret it next time you go to re-configure system.?
Good luck!
jeff
