Friends of the Cumbres & Toltec - FriendsOfCumbresToltec.org

John Cole found this on the pipe from the Lava Pump House to the Lava Tank. This coupling changes the pipe from 3" to 4". He's assuming it's a check-valve, but would like to know for sure.

Not a check valve

Tom C.

Thanks, Tom.

Based on the picture and the description, I would say it is a cast iron 3" X 4" swedge (reducer). It looks pretty heavy duty, so it could have been 'repurposed' from some other intended use.

Thanks, Tom. Very much appreciated.