Walk into any hardware store and you'll see them: SharkBite push-to-connect fittings. No press tool, no special skills — just push the pipe in and you're done. They're marketed as the easy answer to plumbing repairs, and I'll be honest: they have their place. But as a plumber, I don't recommend them for permanent installations, and here's why.
What They Are (and What They're Good For)
SharkBite fittings use a stainless steel grab ring and an O-ring seal to grip the pipe and hold water pressure. Push the pipe in, the teeth bite, the O-ring seals, and you've got a connection in seconds. No press tool, no waiting.
For emergency repairs, they're genuinely useful. Pipe bursts at 10 PM on a Sunday and you need water stopped and a temporary connection holding until morning? A SharkBite cap or coupling gets you through the night. I keep them on the truck for exactly that reason — as a temporary fix, not a permanent solution.
The O-Ring Problem
Here's the core issue: a SharkBite's entire grip on the pipe comes down to a stainless steel grab ring and a single rubber O-ring. Rubber degrades. It hardens, it cracks, it loses elasticity — especially with hot water running through it year after year, and especially with the chloramine and other chemicals in municipal water supplies.
Now, to be straight with you: press copper fittings have a sealing element too. The difference is what happens around it. A press tool mechanically deforms the fitting onto the pipe — the metal itself is crimped down, creating a permanent mechanical bond that locks the fitting in place. The seal is backed up by metal that's been physically pressed into the pipe. A SharkBite has no such mechanical lock. It's just the grab ring's teeth biting into the pipe surface and the O-ring doing the sealing, with nothing preventing the fitting from rotating or working loose over time.
They Move
SharkBite fittings can rotate on the pipe. That's by design — but in a wall cavity or under a floor, rotation plus water hammer plus thermal expansion and contraction means the fitting is working itself over time. I've seen them walk off the pipe enough to start weeping. A weep inside a wall doesn't announce itself — it soaks insulation and framing quietly until you've got mold or rot.
Pressed and crimped connections don't rotate. They don't walk. They stay where you put them.
Buried Connections Make Me Nervous
The idea of a push-fit connection sealed up behind drywall or under a slab bothers me. If a press joint was done right, it's as strong as the pipe itself. If a SharkBite O-ring fails in ten years behind a finished wall, you're opening the wall to fix it — and the water damage has a head start.
I'll use them where they're accessible — under a sink, in an exposed basement run, somewhere I or a homeowner can see and check them. Behind a wall? No.
The Cost Adds Up
A single SharkBite coupling costs several times what a copper or PEX fitting costs. For one emergency repair, who cares. But if someone roughs in a whole bathroom with push-fit fittings, they've spent a fortune on connections that are less reliable than the cheaper alternatives. It doesn't make financial sense or mechanical sense.
What I Use Instead
- For copper: Press (crimp) copper fittings. A press tool mechanically crimps the fitting onto the pipe, creating a permanent connection — no flame, no solder, no waiting. It's fast, it's clean, and unlike a push-fit, the fitting is mechanically deformed onto the pipe so it can't walk off or rotate loose. This is my go-to for copper work.
- For PEX: Expansion fittings (like Uponor/Wirsbo) or proper crimp rings. Both create a permanent mechanical connection that locks onto the pipe.
- For transitions: The right adapter for the materials involved, installed properly. No shortcuts.
The Bottom Line
SharkBites aren't junk — they're a useful emergency tool. But there's a difference between stopping a leak at midnight and building plumbing that's supposed to last 30 years inside your walls. For permanent work, I use press copper fittings and proper PEX connections, because I've seen what holds up over time and what doesn't.
If you've got SharkBite fittings buried in your walls from a previous repair or a DIY job and you want them replaced with permanent connections, call Concepts Plumbing at (705) 715-1513 for a free estimate in Barrie and Simcoe County. Better to fix it on your schedule than on the water's schedule.
