PVC fittings and pipe size differences dust collection

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by spalted posted 12-22-2015 05:56 AM 1478 views 0 times favorited 9 replies Add to Favorites Watch
View spalted's profile


25 posts in 4488 days

12-22-2015 05:56 AM


I was given a ton of elbows and y fittings for 4” pvc that I want to use for a dust collection system. I believe they are sized for schedule 40. They are too large for the green pvc drain pipe of the same 4” diameter. Is there a way I can use these fittings with the cheaper thinner wall pvc I find at lowes or am I forced to use sc40 pipe only?

9 replies so far

View Fred Hargis's profile

Fred Hargis

7506 posts in 3991 days

#1 posted 12-22-2015 12:04 PM

Depends on how much effort you want to put into it. You can heat thinwall and stretch it (or shrink it) with a heat gun, or you could use any of a lot of methods of filling the gap. That would include wraps of duct tape, wooden doughnuts, jamming the thinwall into the fitting past the larger joint area, and probably several dozen other ways I haven’t thought of. If it was me I think I’d try to figure out the cheapest way…either toss the fittings and buy thinwall ones, or stick with the schedule 40 pipe.

-- Our village hasn't lost it's idiot, he was elected to congress.

View Lifesaver2000's profile


556 posts in 4610 days

#2 posted 12-22-2015 12:36 PM

There are reducers available that glue into a schedule 40 fitting that adapt it over to the S&D size pipe. You will just have to figure if it works out cost wise. From a plumbing supply house this stuff can be pretty cheap compared to prices at Home Depot or a local hardware store.

View WoodNSawdust's profile


1417 posts in 2674 days

#3 posted 12-22-2015 01:03 PM

I remember seeing a home improvement show where a plumber had pieces of PVC glued together and he needed to make changes. He cut the PVC pipe off as it left the fitting and then used a special tool to ream out the PVC that was glued into the fitting.

You could find a short piece of schedule 40 pipe, glue it into the fittings, cut it off, and then use the above mentioned tool to ream it out to the correct size for the pipe you need.

-- "I love it when a plan comes together" John "Hannibal" Smith

View conifur's profile


954 posts in 2650 days

#4 posted 12-22-2015 02:11 PM

When I checked into using PVC for dust collection schedule 20 fits the best, but could not find any.

-- Knowledge and experience equals Wisdom, Michael Frankowski

View ChrisK's profile


2076 posts in 4579 days

#5 posted 12-22-2015 02:23 PM

You can get schedule 10 pvc from several places.

The OD is the same, the wall is thinner. sch 10 from McMaster reemer

-- Chris K

View jakep_82's profile


108 posts in 3804 days

#6 posted 12-22-2015 08:06 PM

They make fitting adapters, but it might cost more than just buying new fittings.

View spalted's profile


25 posts in 4488 days

#7 posted 12-22-2015 11:22 PM

Thanks for all the replies. I found the adapters at lowes too and after a few minutes I realized I’d probably spend less just buying new Ys and elbows for the thin wall pipe. Well here I go assembling my new dc system!

View AandCstyle's profile


3306 posts in 3755 days

#8 posted 12-22-2015 11:59 PM

Spalted, if you haven’t already spent the money, follow Fred’s suggestion and wrap the green tubing with duct tape until the diameter gives a nice tight fit with the schedule 40 fittings. I used gorilla tape because it is very thick and didn’t require many wrappings. HTH

-- Art

View JeffP's profile


573 posts in 2890 days

#9 posted 12-23-2015 01:35 AM

You could just use the southern-pride “there, I fixed it” solution.

just butt the two things together with no particular care or interest in how well or unwell they mate…then “mate them” with duct tape.

Actually, I would recommend this method, but with the “real” duct tape that pro’s use for HVAC installations. It is metal-backed peel & stick tape.

You could darn near fix a blown engine block with that stuff. I just love it. Unlike “regular duct tape”, this stuff doesn’t dry out and fall off after a few months. You can find it next to the cheap duct tape in the HVAC aisle at Home Despot or Lowes.

-- Last week I finally got my $*i# together. Unfortunately, it was in my shop, so I will probably never find it again.

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics