Most of the regulations from the Obama administration working their way through the courts raise an issue concerning Chevron deference. The Supreme Court has before it a case, Esquivel-Quintana v. Sessions, raising the question whether Chevron deference trumps the rule of lenity in criminal cases. Auer deference has also come under attack in recent years. As with Chevron, in some circumstances the Court has declined to apply Auer deference altogether. Christopher v. SmithKline Beecham Corp., 132 S.Ct. 2156 (2012). In other cases, individual Justices have argued that it is time to reconsider Auer deference.
Brickeyee is on the point. ALL PEX piping uses some sort of Barb fitting with a compression ring. I have never ever heard of a single failure with this type system. Compression fittings use a ferrule either brass or plastic. The brass ferrule bites into the pipe wall, but the plastic ferrule does not. It is not a surprise to me that a Compression fitting which has a plastic ferrule failed.
Where 1/2-inch and 3/4-inch ratings for PEX (and copper) plumbing pipe comes from is from the I.D. of the pipe. The PEX pipes are made with an I.D. that matches the I.D. sizing of its copper-pipe counterpart.ay! Once the plumbing was exposed, we found that we had 3/4-inch PEX supply lines coming to the bathroom, which were split inside the shower wall to two sets of 1/2-inch PEX lines: one set going to the shower, the other set going to the tub and sinks.