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.

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POWERTEC 70108 4 Inch Blast Gate for Dust Collector, Dust Collection Fittings

POWERTEC 70108 4 Inch Blast Gate for Dust Collector, Dust Collection Fittings

Product ID: 140104681

Details

Brand
POWERTEC
Colour
Black
Connector type
Slip
Global Trade Identification Number
Item dimensions L x W x H
16.8 x 16.5 x
Item weight
159 g

💨Optimizes airflow control for dust collection

📏4-inch nominal diameter for universal fit

🛡️Premium abrasion-resistant ABS plastic

HK$333

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Description

💨 Control the flow, conquer the mess — your dust-free workshop awaits!

UNIVERSAL COMPATIBILITY - Works with most professional and home workshop dust collection setups—just add a flex cuff for 4” OD ports.
DURABLE ABS CONSTRUCTION - Built to withstand daily wear from sawdust, woodchips, and debris without cracking or warping.
LIGHTWEIGHT COMPACT DESIGN - Easy to install and handle at just 159 grams, fitting perfectly into tight workshop spaces.
PRECISION FIT FOR 4 INCH SYSTEMS - Seamlessly connects with 4” ID dust hoses and ports for hassle-free installation.
MAXIMIZED DUST COLLECTION EFFICIENCY - Manually regulates airflow to direct suction exactly where you need it, reducing system strain.

The POWERTEC 70108 4 Inch Blast Gate is a robust, abrasion-resistant ABS plastic accessory designed to optimize airflow in dust collection systems. Featuring a nominal 4-inch diameter, it fits most 4” ID hoses and ports, allowing precise manual control of vacuum flow to targeted machines. Lightweight and easy to install, it enhances dust collection efficiency and durability in professional and home workshops alike.

Specifications

ASIN	B005VRPQ92
Best Sellers Rank	351,221 in DIY & Tools ( See Top 100 in DIY & Tools ) 431 in Dust Collectors & Air Cleaners
Brand	POWERTEC
Colour	Black
Connector Type	Slip
Country of Origin	Taiwan
Customer Reviews	4.5 4.5 out of 5 stars (1,988)
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	159 g
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

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HK$333

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

Secure transaction

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