The description says sweat connection but the model number and picture shows 3/3 mip thread. which is it?

Mine was as in the picture, threaded MIP. The sweat one is a different product number.

Will this work at the well pump? Hammers every time it shuts off.

Works any where there is a hammer. Sizing is the issue. You may need a bigger unit for the main pump line or multiple units.You may also want to consider a non-slamming soft shut check valveon the down stream side of the pump.

"will it fit a garden hose type thread ?"

If you need one for garden hose thread . Look for washing machine hammer arrestor since washers use the game garden hose thread

The mini water arrestors worked for about a year +. Will this size work for washing machine? And can I simply replace the mini with this size?

I would think that this arresor would work fine but it might not be as simple to install as the mini arrestor The mini arrestor has a tee built into it that just attaches to the faucet. If you can remove the faucet from the water line and install a brass tee in it's place then screw the faucet and the 653 arrestor into the tee I would think that the 653 arrestor would work good. It might even be able to absorb water hammer that is generated from other sources.

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Sioux Chief 653-B Hydra ester Water Hammer Arrester for Piping Systems

Sioux Chief 653-B Hydra ester Water Hammer Arrester for Piping Systems

Product ID: 8963880

Details

Brand
Sioux Chief
Color
Bronze
Handle Material
Stainless
Head Material
Stainless
Item Weight
0.01 Ounces

🔧10,000+ shock cycles tested

🏗️Fits 2x4 wall cavity installation

🛡️ANSI/ASSET 1010-2004 certified

47271CFA

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Sold byAmazon Cote D' IvoireDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Stop water hammer before it starts—engineered for pros who demand perfection!

SPACE SMART DESIGN - Engineered for easy installation within standard 2x4 wall cavities—no extra space needed.
UNMATCHED DURABILITY - Lifetime cycle tested to endure over 10,000 shock cycles, ensuring long-term reliability.
CERTIFIED PERFORMANCE - Meets rigorous ANSI/ASSET 1010-2004 standards for guaranteed safety and efficiency.
SEAMLESS COMPATIBILITY - Works flawlessly with press-fitting systems like Viega and all push-fit connections.
EFFORTLESS INSTALLATION - Approved for use without access panels, saving time and hassle on every job.

The Sioux Chief 653-B Hydra-Rester is a piston-type water hammer arrester designed for professional piping systems. It is rigorously tested to withstand over 10,000 shock cycles and certified to ANSI/ASSET 1010-2004 standards. Compatible with major press-fitting systems and engineered for installation in tight 2x4 wall cavities, it offers reliable, space-saving protection against water hammer without requiring access panels.

Specifications

ASIN	B007UQMD8E
Best Sellers Rank	#25,328 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #209 in Valves
Brand Name	Sioux Chief
Color	Bronze
Customer Reviews	4.5 4.5 out of 5 stars (514)
Global Trade Identification Number	00739236107534
Grip Type	Textured
Handle Material	Stainless Steel
Head Material	Stainless Steel
Head Style	Flat
Included Components	Sioux Chief HYDRA-RESTER 3/4 MIP ASSE-B
Item Type Name	Sioux Chief 653-B NLC 3/4 Inch Water Hammer Arrester
Item Weight	0.01 Ounces
Manufacturer	Sioux Chief Mfg.
Manufacturer Part Number	653-B
Model Number	653-B
Number of Items	1
Style Name	German
UPC	739236107534
Unit Count	1.0 Count

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TrustScore 4.5 | 7,300+ reviews

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