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" to 2-1/2" Cone Reducer, Dust Collection Fittings for Dust Collection Hose to Hose Connection

Product ID: 15245457

Details

Brand
POWERTEC
Color
4" to 2-1/2"
Item Length
0.95 inches
Item Weight
3.2 ounces
Manufacturer
Southern LLC
Material
Acrylonitrile

📏Precision fit: 4" to 2.5" hose adapter

🔄Universal compatibility with major vacuums

🛠️Durable ABS plastic construction

€ 18.88

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Description

🔧 Upgrade your dust game — connect smarter, work cleaner!

BUILT TO LAST - Crafted from premium ABS plastic, this reducer withstands abrasive dust and daily workshop wear.
COMPACT LIGHTWEIGHT - At just 3.2 ounces and under an inch long, it integrates smoothly without bulk or hassle.
VERSATILE COMPATIBILITY - Fits Shop-Vac, Sears, and most wet/dry vacuums, making it your go-to dust collection upgrade.
SEAMLESS HOSE TRANSITION - Effortlessly connect your 4" dust collection hose to a 2.5" vacuum line without leaks or loss of suction.
PRECISION ENGINEERED DIMENSIONS - Exact OD and ID measurements ensure a snug, secure fit for optimal airflow and dust control.

The POWERTEC 70136 Cone Reducer is a precision-engineered 4" to 2.5" dust collection hose adapter made from durable ABS plastic. Designed for seamless connection between larger dust collection hoses and smaller vacuum lines, it fits major wet/dry vacuums like Shop-Vac and Sears. Lightweight and compact, it ensures efficient airflow and long-lasting performance in any workshop setup.

Specifications

Asin	B002DSDSY2
Best Sellers Rank	#9,062 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #6 in Vacuum & Dust Collector Replacement Parts #14 in Power Tool Replacement Parts
Brand Name	POWERTEC
Color	4" to 2-1/2" Cone Reducer
Customer Reviews	4.5 4.5 out of 5 stars (8,296) 4.5 out of 5 stars
Global Trade Identification Number	00736815005656
Included Components	4-Inch to 2-1/2 Inch Cone Reducer
Item Dimensions L X W	4"L x 0.5"W
Item Length	0.95 inches
Item Type Name	POWERTEC 70136 4-Inch Hose to 2-1/2 Inch Hose Cone Reducer
Item Weight	3.2 ounces
Manufacturer	Southern Technology LLC
Material Type	Acrylonitrile Butadiene Styrene (ABS)
Nominal Wall Thickness	0.125 inches
Outside Diameter	3.97 inches
Unit Count	1 Count
Upc	736815005656

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TrustScore 4.5 | 7,300+ reviews

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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€ 18.88

Duties & taxes included

In stock

Sold byAmazon SpainDelivered 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 Spain.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

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TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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