I am over the fact they sent me opened goods, not once but twice. If the fitting leaks then I'll be really pist. Please don't get me wrong, 99% of the time, the stuff I order from them is perfect, and no customs did not open the box... I know I used to work for customs for 6 years and that would be pretty obvious.
The moral of the story is, I dont accept (and I doubt most customers accept) that they knowingly ship opened/returned/unwanted/whatever products to customers who expect to receive the product unused and pay full price and shipping. Who knows? maybe this fitting does leak and thats the reason why it was returned? I just dont think this makes good business practice in like some your say, a 'niche' market.
The fitting itself is not as 'snug' sealing as the unopened one (I brought two btw), there is an obvious difference when pushing them closed. The unopened one takes more force to close, and the opened one doesn't need much at all. Would this mean the rubber seal has 'hardened'?
At the end of the day, it shouldn't matter if I spend $1 or $1000, you should always get what you pay for and as described.