"FarmI" ask@itshall be given wrote in message
u...
"Stormin Mormon" wrote in message
...
First thing comes to mind, is sunlight and the UV rays. So,
what you use should be UV resistant.

White PVC tubing might work for a while.

I have black polypipe that's been in the sunlight for up to 20 years. The
biggest danger to my black polypipe has been from my garden fork and frost
popping the connectors off.


quoteBlack HDPE pipe containing 2 to 2.5% carbon black can be safely
stored outside in the sun without damage from UV exposure. /quote
source: http://www.polymoldproducts.com/PE_PIPES.htm

Some poly pipe can take it and some apparently can not.