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
0.2 Pounds
Manufacturer
Southern LLC
Material
Acrylonitrile

🔄4" to 2.5" seamless hose adapter

⚙️Precision fit for Shop-Vac & more

🛡️Durable ABS plastic build

B/.35

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Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Upgrade your dust collection game with seamless precision!

BUILT TO LAST - Crafted from premium ABS plastic to resist abrasion and ensure long-term workshop durability.
UNIVERSAL VACUUM FIT - Designed to fit Shop-Vac, Sears, and a wide range of wet/dry vacuums for ultimate versatility.
COMPACT LIGHTWEIGHT - Sleek 0.2 lb design that installs and removes quickly, keeping your workflow smooth and efficient.
PRECISION ENGINEERING - Exact dimensions guarantee a snug, secure connection that maximizes dust collection performance.
EFFORTLESS HOSE COMPATIBILITY - Easily connect 4" dust collection hoses to 2.5" vacuum lines without leaks or fuss.

The POWERTEC 70136 Cone Reducer is a high-quality ABS plastic adapter that converts 4-inch dust collection hoses to 2.5-inch vacuum hoses, compatible with popular wet/dry vacuums like Shop-Vac and Sears. Engineered for durability and precision fit, it ensures efficient dust collection and easy installation in any professional or home workshop.

Specifications

ASIN	B002DSDSY2
Best Sellers Rank	#21,043 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #13 in Vacuum & Dust Collector Replacement Parts #34 in Power Tool Replacement Parts
Brand Name	POWERTEC
Color	4" to 2-1/2" Cone Reducer
Customer Reviews	4.6 4.6 out of 5 stars (6,807)
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	0.2 Pounds
Manufacturer	Southern Technology LLC
Material Type	Acrylonitrile Butadiene Styrene (ABS)
Nominal Wall Thickness	0.125 inches
Outside Diameter	3.97 Inches
UPC	736815005656
Unit Count	1.0 Count

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