Frey Scientific Vinyl Plastic Tubing - 1/2 inch ID x 1/16 inch Wall x 50 feet L

Apparently the supplier doesn't know the difference between ID (INSIDE diameter) and OD (OUTSIDE diameter)! The first tubing I received was 3/8' ID, 1/2" OD. I returned the tubing and pointed out that the item ordered was clearly advertised as 1/2" ID tubing. After 3 weeks, I received a replacement shipment. Guess what? The replacement was identical to the first shipment: 3/8" ID 1/2" OD! I want my money back. Three weeks waiting for a replacement is excessive, especially when they send the same incorrect item again.Update 7/11/2014: I noticed that Amazon has modified their ad page to correctly specify the tubing as 1/2" OD instead of the original 1/2" ID. One letter makes quite a difference. Since they corrected their error and refunded my money, I'm going to bump my rating to 2 stars.

Just what I needed to build a custom long siphon tube to expel aquarium water outside of the house into the plants. I didn't want to spend the big bucks for a Python system so I just made my own with this and a cheap submersible water pump with an output that supports 1/2" tubing. Works perfectly an no wasting water down the drain like Python system.