blast gate question

  • Advertise with us

« back to Woodworking Skill Share forum

Forum topic by EBreindel posted 08-06-2019 05:40 PM 336 views 0 times favorited 9 replies Add to Favorites Watch
View EBreindel's profile


11 posts in 1019 days

08-06-2019 05:40 PM

Does anyone know any 4 inch blast gates that work well with the thin wall sewer and drain pipe sold at Home Depot and Lowes? This is substantially less expensive than PVC and was wondering if anyone has an experience or with purchasing blast gates that fit well.


9 replies so far

View Fred Hargis's profile

Fred Hargis

5696 posts in 2977 days

#1 posted 08-06-2019 06:38 PM

I seriously doubt you will find any that fit right out of the box. To get some that fit, I built my own using the PVC fitting (sawed the parts off I needed for the nipples). Otherwise, it’s wooden donuts, duct tape (the easiest) or some other form of some thing to make things fit. You can also modify the PVC pipe itself by cutting slits and squeezing it down…or heating to expand it, or some other methods (most of these might require some silicone as well). If you choose to build them yourself, there are a lot of variations available by searching around a little. Store boiught blast gates seem to be a metric 4”, and PVC is a pipe fitters 4”....and never the twain shall meet.

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

View EarlS's profile


3033 posts in 2832 days

#2 posted 08-06-2019 07:48 PM

I used duct tape if the blast gate OD needed to be bigger to seal in the sewer pipe. Different brands fit differently.

-- Earl "I'm a pessamist - generally that increases the chance that things will turn out better than expected"

View controlfreak's profile


149 posts in 85 days

#3 posted 08-06-2019 08:20 PM

I know with PVC you can adjust the fittings easily if you point a heat gun at them. It also helps if you say “freeze Gopher”

View Rayne's profile


1216 posts in 2023 days

#4 posted 08-06-2019 09:11 PM

Using a heat gun is the best method, IMO. Fast and flexible. Here’s a video demonstrating it.

View pottz's profile


6029 posts in 1468 days

#5 posted 08-06-2019 09:46 PM

i use the ones from rockler with the thin wall drain pipe with no problem.i seal all my connections with aluminum foil tape which molds very well.take a look at my shop pic’s and you will see what ive done.ive never had to heat the pipe.

-- sawdust the bigger the pile the bigger my smile-larry,so cal.

View Picken5's profile


282 posts in 3176 days

#6 posted 08-06-2019 09:47 PM

I got some of the Powertec 70135 4-inch blast gates and I’ve used sewer piping and fittings from Lowe’s. The fit was snug, but it worked.

-- Howard - "Time spent making sawdust is not deducted from one's lifetime." - old Scottish proverb

View Redoak49's profile (online now)


4147 posts in 2472 days

#7 posted 08-06-2019 10:30 PM

I would build your own blast gates. I have done that to fit the sewer pipe both 6” and 4”. They work well and fit well.

View BurlyBob's profile


6472 posts in 2749 days

#8 posted 08-06-2019 10:55 PM

I used a piece of crimped sheet metal dryer vent for mine and some Tyvek tape. It was maybe $4. I had to hammer out the crimp to get a nice tight fit.

View ibewjon's profile


924 posts in 3277 days

#9 posted 08-06-2019 11:57 PM

I get the best fit using steel duct.

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