Does anyone have any experience with this type of watering cup?

I purchased 6 of these with the brackets and have had 3 of the 4 brackets I connected crack. This is fairly unusual for PVC to crack this easily. I know it is susceptible to exposure to sunlight over time, but these are brittle right out of package.
I've read where other people have had issues too. It appears that it has just been the white brackets that have been cracking.
I noticed Cutler supply is carrying a black version of the bracket does anyone have any experience with these?
http://www.cutlersupply.com/cart/index.php?main_page=product_info&cPath=11_60_63&products_id=491
I went to my local builder supply house, they had fittings like the one in the this image from "clanreed" but they were $8 a piece.

Any suggestions would be greatly appreciated.
Thank you
I purchased 6 of these with the brackets and have had 3 of the 4 brackets I connected crack. This is fairly unusual for PVC to crack this easily. I know it is susceptible to exposure to sunlight over time, but these are brittle right out of package.
I've read where other people have had issues too. It appears that it has just been the white brackets that have been cracking.
I noticed Cutler supply is carrying a black version of the bracket does anyone have any experience with these?
http://www.cutlersupply.com/cart/index.php?main_page=product_info&cPath=11_60_63&products_id=491
I went to my local builder supply house, they had fittings like the one in the this image from "clanreed" but they were $8 a piece.
Any suggestions would be greatly appreciated.
Thank you
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