[RustyYellow]

Can one change from a manual relief to an automatic relief with no problems?

Is lengths different that makes one manual vs automatic, or internals?

Got a hydro that needs both valves, but company I found only have the automatic valves.

Mower these will go into is not a Cub, but it uses same Series 15, type U hydro.

Here's a pic of mower. 1990 Kut Kwick using Onan 20P as power. It's a commercial I use to mow 5 acres. Hydro is seen in 2nd pic. It's a beast and weighs in around 1,200#s.