Can this replace the p728c? can you take the hook off the old one or buy a new w hook to go with it?

I think the only difference with the "C” is the hook at the bottom, which is a safety measure that keeps it from impaling you if it breaks and you are nearby. You can take the hook off your old springs, as I did, and it’s just fine.

What's the difference between P728 and P728C?

The P728 does not include a "w" or "c" hook while the P728C used to come with a w-hook attached. We are not shipping w-hooks on any of our springs anymore.

The spring already has a safety cable inside it.

My garage uses 4. Can use 2 of these and 2 of the p528...or do all 4 need to be the same? Want to keep door up during Rain.

Yes you can use a mix of P728 and P528 to achieve a higher load capacity on the springs. If you have an existing, balanced door with all P728 springs, then you will want to stick with all P728 springs. If it is a new door, you will need to determine the weight of the door and then appropriately balance the door once you go to install.

Brand	E900 HARDWARE
Mounting Type	Ceiling Mount
Material	Alloy Steel
Color	Black
Style	Modern
Finish Type	Powder Coated
Number of Pieces	1
Manufacturer	E900 HARDWARE
UPC	859802006044
Part Number	P728
Item Weight	4.5 pounds
Product Dimensions	1.31 x 1.31 x 31 inches
Size	28"
Finish	Powder Coated
Item Package Quantity	1
Batteries Required?	No

E900 HARDWARE P728 28-inch Plug-End Garage Door Spring (.177" 7 Wire)

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