"It's unwise to pay too much.  But it's worse to pay too little.  When you pay too much, you lose a little money, that is all.  When you pay too little, you sometimes lose everything, because the thing you bought was incapable of doing the thing it was bought to do.  The common law of business balance prohibits paying a little and getting a lot.  It can't be done.  If you deal with the lowest bidder, it is well to add something for the risk you run.  And if you do that, you will have enough to pay for something better.  There is hardly anything in the world that someone can't make a little worse and sell a little cheaper - and people who consider price alone are this man's lawful prey. " 

John Ruskin/1819-1900 

Wise words that are over 100 years old but as true today as when they were first spoke. This is never more true than with industrial components like nozzles. Often the nozzle is the last part of system that is worth 100's or 1000's of time more than the nozzle itself and yet if the nozzle fails the whole system fails. This begs the question why take the risk and buy purely on price? Its a false economy.