Most push fit fitting these days are approved for concealed applications (in-wall/underground) and permanent installation. For many, however, there remains a heavy air of skepticism around push-fit, especially when it comes to concealed or permanent installation. The perception that push-fit is only suitable for temporary emergency repair (which it is great for) is one popular among plumbers, but increasingly challenged by DIYers using the technology across a range of applications.
Much of the skepticism surrounding push-fit has to do with its perceived lack of a track record. Although push-fits haven't been around nearly as long as copper soldering, they have had a good few decades to establish a decent foothold in the DIY market: John Guest fittings have been widely used since the 80s. The SharkBite system came about more recently - about the mid-2000s - but has quickly gained the loyal support of DIYers as well as an official nod from the many municipalities who permit their use throughout plumbing systems.
Another reason for skepticism lies in the technology itself: many plumbers feel that steel teeth and an O-ring alone cannot possibly create a secure, long-lasting connection. Compared to the visceral act of soldering with an open flame, simply pushing a pipe into a fitting feels a bit dubious. Likewise, just the appearance of a well-soldered joint can inspire more confidence than a bulky piece of plastic or brass. But these are just appearances: there is no evidence that push-fit fittings have a notably higher failure rate than anything else in a plumber's arsenal. It's true that when it comes to joining copper and CPVC, solder and glue will always be best - but there are skill levels and situations where something quick and simple is a huge help.
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