Plumbing fittings, price and/or quality?
My wife and I are working with ponds and pond plants, so far in a small way. We need to replace a specialized fitting -- specifically, a 2" bulkhead fitting. After determining that I couldn't buy one at Home Depot I checked the web. I found several sources of supply, but I was shocked by the variety of prices. One company offers the item for $7.00, another for $19.49. There's a range of other prices between, although most of them are in the $9-$12 range.
My question is: are these items pretty much all alike, or are some better than others? Might the difference in prices reflect a difference in quality?