Can anyone tell me the actual outside diameter of the flange on the 4"

I used 4" schedule 40 PVC and it fit snugly on the 4" blast gate. I also drilled and screwed two sheet metal screws per blast gate (along with silicon sealer)

Are they both 4" od, or is one size 4"id for dc machine port?

No, They are 3 11/16 id and 3 13/16 + 1/32 od. There is nothing 4" here.

any suggestions on how to attach this to 4" DWV? The pipe is too large for these.

I didn't hook them up to 4inch. I ran 2 3/4 flex and pvc. Btw...it clogs up with saw dust. I drilled a hole on side opposite the slide with a forsner bit to blow it out. I cover the hole with duct tape.

The action on the 4" plastic version is very rough / jerky. Any successful method of smooting the action? Grease?

I found it varies from one gate to another. Applying wax from a candle or similar source, helped but did not fully fix the issue. I just rubbed it on the flat portion that fits in the groove and worked it back and forth. I would be afraid that grease would trap dust. I prefer metal gates.

Powertec 70108 4 Inch Blast Gate For Dust Collector Dust

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

💨 Take control of your dust flow—because clean means professional.

AIRFLOW MASTERY - Manually regulates vacuum flow to maximize dust collection efficiency across your workshop.
EASY INSTALLATION - Slip connector design ensures quick setup—get your system running faster and cleaner.
WORKSHOP ESSENTIAL - Trusted by pros and hobbyists alike to keep workspaces dust-free and productivity high.
PRECISION 4 INCH FIT - Seamlessly connects with 4” ID dust hoses for universal compatibility.
DURABLE ABS CONSTRUCTION - Built to withstand daily wear from sawdust, woodchips, and debris without faltering.

The POWERTEC 70108 4 Inch Blast Gate is a premium ABS plastic dust collection fitting designed to regulate airflow in 4-inch dust collection systems. Compatible with 4” ID hoses and ports, it enhances system efficiency by directing vacuum flow to specific machines. Durable and abrasion-resistant, it’s a must-have for any professional or home workshop aiming for cleaner, safer air.

Specifications

ASIN	B005VRPQ92
Best Sellers Rank	359,632 in DIY & Tools ( See Top 100 in DIY & Tools ) 442 in Dust Collectors & Air Cleaners
Brand	POWERTEC
Colour	Black
Connector Type	Slip
Connector type	Slip
Country of Origin	Taiwan
Customer Reviews	4.5 out of 5 stars 1,988 Reviews
Global Trade Identification Number	00736815003416
Included Components	4-Inch Blast Gate for Vacuum/Dust Collector
Item Dimensions	16.8 x 16.5 x 8.9 centimetres
Item Type Name	POWERTEC 70108 4 Inch Blast Gate for Dust Collector/ Vacuum Fittings
Item Weight	0.35 Pounds
Item dimensions L x W x H	16.8 x 16.5 x 8.9 centimetres
Manufacturer	POWERTEC
Material	Acrylonitrile Butadiene Styrene
Model Number	70108
Number of Packs	1
Number of Pieces	1
Part Number	70108
Set Name	Single
Size	4" (1pk)
UPC	074994519060 736815003416
Unit Count	1.0 count

Reviews

J**T

Powertec blast-gate

My husband needed this product and he is very happy with it and it came very quickly in the post. Thank you Amazon.

14.09.2019

S**Y

It’s ok

Bit flimsy but it does work

2.12.2019

M**S

Excelente justo lo que necesito

30.11.2023

M**A

Nota 10

6.05.2026

J**R

Great product!

Great product! I used this to put in the window of the room where I have my laser engraver. I attached it to a piece of plywood that I then placed in the window opening. Attached a standard dryer vent hose and it works great! I like that I can close the vent by sliding the little door.

22.04.2026

J**S

Well made

As described. I have this 4" blast gate and a 2.5" blast gate going from my dust collect to separate hoses. Both blast gates are sturdy and work well.

28.08.2023

J**N

POWERTEC 70108 Druckgitter, für Staubsauger, 10,2 cm (4 Zoll), 7010

ich habe gedacht es ist ein wenig stabiler gebaut .

6.03.2021

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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Customer service was outstanding when I had questions about the product.

2 days ago

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€ 49.27

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Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago