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

Product ID: 324137994

Details

Brand
POWERTEC
Colour
Black
Item weight
91 g
Material
Acrylonitrile
Product dimensions
10.2L x 1.3W

⚡Quick & easy installation

📏Precision fit for 4" to 2.5" hoses

🛠️Durable ABS plastic resists abrasion

AR$80112

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Description

🔗 Connect with Confidence: The ultimate dust collection upgrade you didn’t know you needed!

BUILT TO LAST - Crafted from premium ABS plastic to withstand tough workshop conditions and abrasive dust.
HASSLE FREE SETUP - Double-sided cone design ensures quick installation and removal, saving you time.
COMPACT LIGHTWEIGHT - Slim 1.5-inch length and 91g weight make it easy to handle and install anywhere.
UNIVERSAL COMPATIBILITY - Fits a wide range of shop vacuums including Shop-Vac and Sears for versatile use.
SEAMLESS HOSE TRANSITION - Effortlessly connect 4" and 2.5" dust collection hoses for optimized airflow.

The POWERTEC 4-Inch to 2-1/2-Inch Cone Reducer is a precision-engineered adapter designed to connect larger 4" dust collection hoses to smaller 2.5" shop vacuum hoses. Made from durable ABS plastic, it offers abrasion resistance and long-term reliability. Lightweight and compact, it fits popular vacuum brands and ensures quick, tool-free installation, making it an essential upgrade for efficient dust management in any professional or home workshop.

Specifications

ASIN	B002DSDSY2
ASIN	B002DSDSY2
Best Sellers Rank	#91,007 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #4 in Vacuum & Dust Collector Reducing Couplings
Brand Name	POWERTEC
Color	Black
Country of Publication	Taiwan
Country of origin	Taiwan
Customer Reviews	4.5 4.5 out of 5 stars (6,524)
Customer reviews	4.5 4.5 out of 5 stars (6,524)
Date First Available	28 July 2017
Global Trade Identification Number	00736815005656
Included Components	4-Inch to 2-1/2 Inch Cone Reducer
Is Discontinued By Manufacturer	No
Item Dimensions L x W	10.2L x 1.3W centimeters
Item Length	1.5 Inches
Item Type Name	4-Inch to 2-1/2 Inch Cone Reducer
Item Weight	91 g
Item model number	70136
Manufacturer	POWERTEC
Manufacturer	POWERTEC
Material Type	Acrylonitrile Butadiene Styrene (ABS)
Nominal Wall Thickness	0.125 inches
Outside Diameter	3.97 Inches
Product Dimensions	10.16 x 10.16 x 10.16 cm; 90.72 g
UPC	736815005656
Unit Count	1 Count

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AR$80112

Duties & taxes included

In stock

Sold byAmazon ArgentinaDelivered 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 Argentina.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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