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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🔗 Connect with confidence — the ultimate dust collection adapter you didn’t know you needed!

BUILT TO LAST - Crafted from premium ABS plastic, this reducer resists abrasion and stands up to tough workshop environments.
PERFECTLY SIZED - Engineered with exact dimensions to ensure a snug, secure fit for optimal dust collection performance.
LIGHTWEIGHT COMPACT - At under 100 grams and just over 10 cm in size, it’s easy to install and won’t weigh down your setup.
EXCLUSIVE COMPATIBILITY - Designed specifically for 4” and 2.5” hoses—avoid costly mismatches and keep your system running smoothly.
SEAMLESS HOSE TRANSITION - Effortlessly connect your 4-inch dust collection hose to a 2.5-inch vacuum line without leaks or loss of suction.

The POWERTEC70136 Cone Reducer is a precision-engineered adapter that steps down from a 4-inch dust collection hose to a 2.5-inch vacuum hose. Made from durable ABS plastic, it offers a lightweight yet robust solution for workshop dust management, ensuring a tight fit and reliable performance exclusively for 4” and 2.5” hoses.

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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	Plastic, Acrylonitrile Butadiene Styrene
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

POWERTEC70136 4-Inch to 2-1/2 Inch Cone Reducer

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