Is the hammer arrester bypassed when the valve is open? It looks like the valve closes off flow to the arrester when open.

No. The hammer arrestor always directly connect the waterflow no matter the valve is on or off.

What is the size of the box? (It looks rectangular in photo)

Yes. It is rectangular, which is 7 "x5.5"

How much longer with the stainless hammer arresters work vs the copper?

We are assum the same. The stainless steel hammer can keep the apperance clean for longer time

Do these come in 5/8" cinch or crimp connection for 3/4" pex

Yes They come in both expansion pex a and in pex b (crimped)

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Specifications

Material	Stainless Steel
Brand	EFIELD
Item dimensions L x W x H	8 x 8 x 3.5 inches
Exterior Finish	Copper,Stainless Steel
Inlet Connection Type	Cross Linked Polyethylene
Outlet Connection Type	PEX
Number of Ports	2
Outlet Connection Size	0.75 Inches
Specification Met	UPC
Valve Type	Ball Valve
Manufacturer	EFIELD
UPC	791689823140
Part Number	mh
Item Weight	2.42 pounds
Product Dimensions	8 x 8 x 3.5 inches
Item model number	mh
Size	9.25 inch x 3.5 inch x 8 inch
Color	Stainless Steel,White,Brass
Finish	Powder Coated
Pattern	With Stainless Steel Arrester
Item Package Quantity	1
Measurement System	inch
Batteries Included?	No
Batteries Required?	No

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