Adapting 6" (150 mm) plastic sewer drain pipe to 4" ribbed flex hose

[Aaron Rosenthal]

I have a 2 HP dust collector with a 6" inlet. I've begun plumbing in (and adapting) the 150mm /6" PVC elbows and straight lengths along the run, but I've become stymied at adapting the pipe to flex, corrugated hose from my machinery.
Sawstop PCS = 4" outlet; Harvey bandsaw =4 outlet ", Dewalt planer, well you get the idea.
I have the 6" to 4" "Y"s, but then I have the problem.
The 4" coming off the "Y" has an inside diameter of 4" and outside diameter of 4 1/4"; my flex hose is 4" outside diameter so I can manfully stuff it in, but I have no idea how to mechanically keep it together besides using duct tape. If I inset a piece of 4" PVC, as part of the drop, I can't either expand the "slinky" hose or get it to fit.
Has anyone come across this problem, and how did you solve it? Fernco fittings? Home made adapters?

[Steve Eure]

Here is an example of what I have used in the past. You will still have to use a fernco fitting for the 6" size tp cpnnect since the od is only 6". I have used a heat gun to expand the pvc to fit over the adapter with some success, eliminating the need for the fernco. I have found a great deal of items for DC at Grizzly's website. They carry a large inventory of fittings for DC. I would check them out to see if they have other options.

https://www.grizzly.com/products/sho...0aAlzjEALw_wcB
https://www.amazon.com/Reducer-Dust-.../dp/B009VDQCQ8

[Curt Harms]

6" X 4" PVC is pretty easy, there's a PVC reducer fitting for that. I put some silicone on the inside of the 6" side of the 6 X 4 fitting and added 4 #8 bolts with fender washers to hold the hose inside the 6" opening of the PVC reducer. 4" PVC to metal may be trickier. In my case 4" S & D PVC fit over the metal dust collection ports on machines. I used a few self drilling self tapping screws to hold the 4" PVC in place. My early model Grizzly 1023 didn't have a dust port so I cut a hole in the door used to clean out the base of the saw and bolted doubled 3/4" plywood over the hole. Made a hole in the plywood to fit an adjustable HVAC elbow. 6" hose fit over the HVAC elbow pretty snugly, held in place with a hose clamp. To make the 4" 'nipples' I cut slots in the 'nipples' and bent them in a little bit so the 4" end of the 6 X 4 reducer would slip easily over the 4" 'nipple' but then once past the slots fit quite snugly.

[Jim Becker]

If you can do a 5" drop, then there's a rubber Fernco sewer fitting that will easily adapt a 5" hose to a 150mm machine port. Performance will be better, too. Otherwise, you can either buy a commercial adapter from folks like Oneida or make something up like others are showing in this thread.

[David M Peters]

I think this adapter is what you're after - the 4.25" OD option converts from PVC to flex hose.

https://www.clearvuecyclones.com/pro...e-adapter-4in/

Clearvue also has two 6 x 4 x 4 wye options.

[Bill Dufour]

I think the tall pineapple juice cans are the correct diameter for flexhose to slip over.
Bill D

[scott lipscomb]

4" rubber no-hub coupling works well for 4" PVC drain to 4" flex duct.

[Bill Dufour]

4" rubber no-hub coupling works well for 4" PVC drain to 4" flex duct.

https://www.fernco.com/products/flex...tock-couplings