[Helena1982]

1) Aqua Master...I have seen some 40 year old, that has never been serviced working as good as new...and they were not clean either.

2) Royal Aqua Master

For single hose:

1) Conshelf

2) Scubapro Mk-5 with 109

Sherwood's seem fairly rugged , but we will really know 30 to 40 years from now. I know the regulators mentioned above will be around in another 30+ years, some will be re-chromed...you can't do that with plastic.