Need at least 20 psi of cracking pressure. We buy them straight thur the supplier they will not sell any less than 100 a pop. We will have a 1/4 npt in out in about a month. We are changing to a new brand. We have to buy these 1,000 a time :( But these will be indestruble. These will be what we are going to replace the black ones with. These will work better for you.
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