Which hose adapter reducer should I get that will connect onto a 4" diameter blast gate outlet then onto or in a 2 1/2" diameter port fitting tblesaw?

Not this adapter, unless you went to HD or Lowes and purchased a 4" thin wall PVC straight connector to convert the blast gate to female. Look at WoodRiver 2-1/2" O.D. Hose to 4" O.D. Quick-Connect Dust Collection Fitting, it appears to be more toward what you are looking for, with a female 4" and will do 2.5" or 2.25" hose connections.

Can I use it to reduce a 4" pvc pipe (water pipe) to a 2-1/2" dust collector hose?

you would have to measure the inside and out Dia.of your pipes.and then check what this product dimensions.

Will this connect directly to 4" abs pipe?

No, you will need a 4”coupler.

I have a Jet bandsaw and the dust comes from a 4" outside dim hole I need to cover and to attach it to a 2 1/4 outside dim vac hose. Will this work?

It looks like the small end is 2 1/4 ID and 2 3/8 OD. The larger end is 3 3/4 ID and 3 7/8 OD. These are tape measurements, not calipers

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POWERTEC 70136 4-Inch to 2-1/2 Inch Cone Reducer

POWERTEC 70136 4-Inch to 2-1/2 Inch Cone Reducer

Product ID: 127578492

Details

Brand
POWERTEC
Colour
Black
Item length
1.5 Inches
Item weight
0.2 Pounds
Manufacturer
Southern LLC
Material
Acrylonitrile

⚡Quick & easy installation

📏Precision fit for 4" to 2.5" hoses

🛠️Durable ABS plastic construction

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Description

🔗 Connect with confidence — the ultimate dust collection upgrade!

BUILT TO LAST - Crafted from premium ABS plastic to resist abrasion and ensure long-term workshop durability.
TOOL FREE SETUP - Install or remove in seconds—maximize your workflow without downtime or hassle.
UNIVERSAL VACUUM FIT - Perfectly adapts to Shop-Vac, Sears, and other popular wet/dry vacuums for versatile use.
COMPACT LIGHTWEIGHT - Slim 1.5-inch length and 0.2-pound weight for easy handling and minimal workspace intrusion.
SEAMLESS HOSE COMPATIBILITY - Effortlessly connect 4" and 2.5" dust collection hoses without leaks or gaps.

The POWERTEC 70136 Cone Reducer is a precision-engineered adapter that steps down 4-inch dust collection hoses to 2.5-inch shop vacuum hoses. Made from durable ABS plastic, it ensures a secure, abrasion-resistant connection compatible with major vacuum brands. Lightweight and compact, it offers quick, tool-free installation to streamline your dust management system.

Specifications

ASIN	B002DSDSY2
Best Sellers Rank	175,463 in DIY & Tools ( See Top 100 in DIY & Tools ) 37 in Vacuum & Dust Collector Reducing Couplings
Brand	POWERTEC
Colour	Black
Country of Origin	Taiwan
Customer Reviews	4.5 4.5 out of 5 stars (6,605)
Global Trade Identification Number	00736815005656
Included Components	4-Inch to 2-1/2 Inch Cone Reducer
Item Dimensions L x W	10.2L x 1.3W centimetres
Item Length	1.5 Inches
Item Type Name	4-Inch to 2-1/2 Inch Cone Reducer
Item Weight	0.2 Pounds
Manufacturer	Southern Technology LLC
Material	Acrylonitrile Butadiene Styrene (ABS), Plastic
Nominal Wall Thickness	0.125 inches
Outside Diameter	3.97 Inches
UPC	736815005656
Unit Count	1.0 count

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B/.44

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In stock

Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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TrustScore 4.5 | 7,300+ reviews

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