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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🔧 Step down your dust game with precision and durability!

PREMIUM ABS DURABILITY - Crafted from high-quality ABS plastic to resist abrasion and ensure long-lasting workshop performance.
QUICK INSTALL REMOVE - Designed for fast, tool-free setup and removal to keep your workflow smooth and efficient.
UNIVERSAL VACUUM READY - Works seamlessly with Shop-Vac, Sears, and many other wet/dry vacuums for versatile dust control.
PRECISION FIT DIMENSIONS - Engineered with exact OD and ID measurements for a secure, leak-free connection every time.
EFFORTLESS HOSE COMPATIBILITY - Easily connect 4-inch dust collection hoses to 2.5-inch shop vac lines without hassle.

The POWERTEC 70136 Cone Reducer is a precision-engineered adapter that converts 4-inch dust collection hoses to 2.5-inch shop vacuum hoses. Made from rugged ABS plastic, it offers a lightweight yet durable solution for workshop dust management, compatible with major vacuum brands and designed for quick, reliable installation.

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Manufacturer	Southern Technology LLC
Part Number	70136
Product Dimensions	10.16 x 10.16 x 10.16 cm; 90.72 g
Item model number	70136
Size	Original
Colour	Black
Style	Cone Reducer
Material	Acrylonitrile Butadiene Styrene (ABS), Plastic
Power Source	Hand Powered
Item Package Quantity	1
Number of Pieces	1
Included Components	4-Inch to 2-1/2 Inch Cone Reducer
Batteries included?	No
Batteries Required?	No
Item Weight	90.7 g

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

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