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

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

HK$165

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Description

🔧 Upgrade your dust collection game with precision and durability!

BUILT TO LAST - Crafted from premium ABS plastic, engineered to resist abrasion and stand up to tough workshop environments.
COMPACT LIGHTWEIGHT - At just 3.2 ounces and under an inch long, it’s easy to install and won’t weigh down your setup.
VERSATILE COMPATIBILITY - Fits Shop-Vac, Sears, and a wide range of wet/dry vacuums, making it the go-to reducer for pros.
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 that maximizes dust collection efficiency.

The POWERTEC 70136 Cone Reducer is a high-quality ABS plastic adapter designed to connect 4" dust collection hoses to 2.5" vacuum hoses. Compatible with major wet/dry vacuums like Shop-Vac and Sears, it offers a precise fit and durable construction to enhance your workshop’s dust management system.

Specifications

ASIN	B002DSDSY2
Best Sellers Rank	#22,650 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #15 in Vacuum & Dust Collector Replacement Parts #31 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 (6,827)
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
UPC	736815005656
Unit Count	1 Count

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HK$165

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered 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 Hong Kong.

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