What size copper pipe works with this as trying to figure out outside ac insulation. what do the dimensions mean as diyer?

It work with up to 7/8 pipe perfectly. With 3/4 will work as well but it will be a little loose . This is required by inspectors convine with a insulation jacket which help to protect the foam overtime and keep the cool of the AC

Is this resistant to UV light (sunlight)?

I forgot to mention in my previous answer how to protect this insulation. I used 4 inch flexible ribbed drain pipe and split it lengthwise for the length of the insulation that I was using outside on my Air conditioning unit To my concrete block wall where it entered my home.. Then I merely wrapped the 4 inch drain pipe around the insulation and wire tied it about the circumference of the pipe in three or four places. This protects it from the sun and was a very inexpensive option and a neater and more secure job. Plus I already had 100 feet of flexible ribbed light weight drain pipe lying around. But it is so cheap and durable enough to last 20 or 30 years. Which should outlast the insulation.

Product dimensions	182.9L x 2.2W centimetres
Manufacturer	K-FLEX USA
UPC	841007117502
Part Number	ARDUPG1808171L12A
Item model number	ARDUPG1808171L12A
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No
Item Weight	603 g

7/8" x 6 ft. Elastomeric Pipe Insulation, 3/4" Wall

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