Well........not sure. Mine (which has failed totally and is in the shop!!!) has 3 canisters next to the reservoir. Two are for right/left hydraulic jacks. The 3rd one is for the slides. However, there is a separate 4th smaller canister connected via line to the top of the reservoir......and that is (I've been told) the device (it has a name, it escapes me) that says "Close bedroom slide first, close dining room next, then kitchen". It's not some program, it's mechanical.......
And that's all I know about it, and is subject to being way off base!
I just know mine ain't workin' at the moment!
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"Next to prayer, fishing is the most personal relationship of man" Herbert Hoover
"American by Birth, Southern by the Grace of God"Lewis Grizzard
FROG AR-0019-242
2016 GMC Denali 3500Dually--2017 CC 36CKTS
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