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: 4132545

Details

Brand
POWERTEC
Color
4" Blast Gate
Connector Type
Slip
Global Trade Identification Number
Item Weight
5.6 ounces
Item dimensions L x W x H
6.6 x 6.5 x

💨Optimizes airflow control

📏4-inch nominal diameter fit

🛡️Abrasion-resistant ABS plastic

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€ 31.50

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Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💨 Take control of your dust—because your workshop deserves the best airflow!

AIRFLOW MASTERY - Manually regulate vacuum flow to maximize dust collection efficiency and keep your workspace pristine.
PRECISION 4 INCH FIT - Seamlessly connects with 4” ID dust hoses and ports for a universal workshop upgrade.
EASY INSTALLATION USE - Designed for pros and hobbyists alike—quick setup means less downtime and more productivity.
DURABLE ABS CONSTRUCTION - Built tough to resist daily wear from sawdust, woodchips, and debris—engineered for longevity.
PROACTIVE MAINTENANCE REMINDER - Regular cleaning prevents clogging and sticking, ensuring smooth, uninterrupted operation.

The POWERTEC 70108 4 Inch Blast Gate is a premium ABS plastic dust collection accessory designed to fit 4” ID hoses and ports. It enhances dust collection efficiency by manually controlling airflow between machines, built to withstand abrasive workshop debris. Ideal for professional and home workshops, it requires routine cleaning to maintain optimal performance.

Specifications

ASIN	B005VRPQ92
Best Sellers Rank	#34,395 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #27 in Vacuum & Dust Collector Replacement Parts #63 in Power Tool Replacement Parts
Brand Name	POWERTEC
Color	4" Blast Gate, 1pk
Connector Type	Slip
Customer Reviews	4.5 4.5 out of 5 stars (2,104)
Global Trade Identification Number	00736815003416
Included Components	4-Inch Blast Gate for Vacuum/Dust Collector
Item Dimensions	6.6 x 6.5 x 3.5 inches
Item Type Name	POWERTEC 70108 4 Inch Blast Gate for Dust Collector/ Vacuum Fittings
Item Weight	5.6 ounces
Manufacturer	POWERTEC
Manufacturer Part Number	70108
Material Type	Acrylonitrile Butadiene Styrene
Model Number	70108
Number of Pieces	1
Set Name	Single
Size	4" (1pk)
UPC	074994519060 736815003416
Unit Count	1.0 Count

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