expansion tank

[Redwood]

It has a bladder.

[hidden 1]

Im not sure if it does .It doesnt tell on the manual.It is made by watts and is a 2 gal DET-5 or DET-12...precharged at 40psi.

[jnaas2]

Are you sure it doesnt have a bladder ? I havent seen one in a long time that didnt have a bladder . Just wondering

[HayZee518]

yeah there's an air space inside whether up or down.

[hidden 1]

I had to install an expansion tank and was only able to install it with top down.It is working fine during thermal expanson psi pressure stays normal.Will it still function in a normal fashon even if not wth top up? .this one doesnt use a bladder system.also-and are they precharged pretty well?Any info is appreciated.