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

Product ID: 324137987

Details

Brand
POWERTEC
Colour
Black
Item dimensions L x W x H
16.8 x 16.5 x
Material
Acrylonitrile
Size
4" (1pk)

📏4-inch nominal diameter

🔄Optimizes airflow control

🛡️Abrasion-resistant ABS plastic

TT$393

Duties & taxes included

In stock

Sold byAmazon Trinidad and TobagoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Take control of your dust—because clean workshops mean sharp minds!

AIRFLOW MASTERY - Manually regulates vacuum flow to maximize dust collection efficiency
EASY INSTALLATION - Simple setup for both pros and DIYers to upgrade their workshop instantly
PRECISION 4 INCH FIT - Seamlessly connects with 4” ID dust hoses for universal compatibility
VERSATILE COMPATIBILITY - Works with most dust collection systems; use with Flex Cuff for 4” OD ports
DURABLE ABS CONSTRUCTION - Built to withstand daily wear from sawdust and woodchips without fail

The POWERTEC 70108 4 Inch Blast Gate is a premium ABS plastic dust collection accessory designed to regulate airflow in 4-inch dust collection systems. Its abrasion-resistant build ensures durability against sawdust and debris, while its universal 4-inch nominal diameter fits most hoses and ports, optimizing your workshop’s dust control with easy installation and reliable performance.

Specifications

ASIN	B005VRPQ92
ASIN	B005VRPQ92
Best Sellers Rank	#107,525 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #55 in Shop Dust Collectors
Brand Name	POWERTEC
Color	Black
Connector Type	Coupling
Country of Publication	China
Country of origin	China
Customer Reviews	4.5 4.5 out of 5 stars (3,055)
Customer reviews	4.5 4.5 out of 5 stars (3,055)
Date First Available	8 September 2013
Global Trade Identification Number	00736815003416
Included Components	4-Inch Blast Gate for Vacuum/Dust Collector
Is Discontinued By Manufacturer	No
Item Dimensions	16.8 x 16.5 x 8.9 centimeters
Item Type Name	POWERTEC 70108 4 Inch Blast Gate for Dust Collector/ Vacuum Fittings
Item Weight	159 g
Item model number	70108
Manufacturer	POWERTEC
Manufacturer	POWERTEC
Manufacturer Part Number	70108
Material Type	Acrylonitrile Butadiene Styrene
Model Number	70108
Number of Packs	1
Number of Pieces	1
Product Dimensions	16.76 x 16.51 x 8.89 cm; 158.76 g
Set Name	Single
Size	4" (1pk)
UPC	074994519060 736815003416
Unit Count	1 Count

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