Stainless steel pinch ring for in-house plumbing.Very reliable and once
pinched and removed the PEX is very difficult to remove from the
fitting anyway, without splitting with a blade.

They are just different manufacturer's systems.

-------------
"Peter Bennett" wrote in message
news.com...
There are two types of "permanent" PEX fasteners.

The one preferred for house plumbing is a copper ring that requires a
fairly expensive tool to compress the ring smoothly around the pipe.

The other, apparently preferred for lawn sprinkler systems, uses a
stainless ring with an "ear" which is squeezed by a less expensive
crimping tool - it leaves the crimped "ear" sticking out from the
ring.

(Perhaps the copper ring is the preferred technique, but won't stand
up to burial, so the stainless crimp is accepted for that - just my
guess...)