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

📏Precise dimensional fit

🔄4" to 2.5" seamless hose adapter

🛠️Durable ABS plastic build

₩32054

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Description

🔧 Upgrade your dust collection game with precision and durability!

PREMIUM ABS DURABILITY - Engineered from high-quality ABS plastic to resist abrasion and last longer in tough workshop environments.
QUICK INSTALL REMOVE - Designed for fast, tool-free installation and removal to keep your workflow smooth and efficient.
PRECISION FIT DIMENSIONS - Exact OD and ID measurements ensure a snug, leak-free connection every time.
UNIVERSAL VACUUM ADAPTER - Works flawlessly with Shop-Vac, Sears, and many other wet/dry vacuums for versatile dust control.
EFFORTLESS HOSE COMPATIBILITY - Easily connect 4" and 2.5" dust collection hoses without hassle.

The POWERTEC 70136 Cone Reducer is a high-quality ABS plastic adapter that seamlessly connects 4-inch and 2.5-inch dust collection hoses. Designed for workshop durability and precise fit, it supports popular vacuum brands and enables quick, reliable hose transitions to optimize dust management.

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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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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₩32054

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered 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 South Korea.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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The product exactly matches the description. Very satisfied with my purchase.

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