I ordered some tank tees from the Aqua Science website. I received tees that were different than those pictured on the website and on my order. (Contrary to the picture on the website, there were no unions to allow the tank tees to be mounted in the correct position. The PRV is required to point down by code, so the parts sent were not compatible with code.) I tried to discuss with customer service, but they apparently don't have any experience in plumbing and couldn't understand the issue. The took the parts back, but wouldn't refund the full price. Very unhappy with Aqua Science. I'll use Supply House in the future.
Update - the full amount was finally refunded. However, the fault was clearly that of Aqua Science by posting the incorrect picture with the item, so it should have been fully refunded without delay.