# Controlling a list based on fluid outflow and inflow **URL:** \ **Category:** Revit\ **Created:** [June 27, 2021, 5:47pm UTC](https://forum.dynamobim.com/t/controlling-a-list-based-on-fluid-outflow-and-inflow/65574 "2021-06-27T17:47:38Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Tiago](https://avatars.discourse-cdn.com/v4/letter/t/f0a364/32.png) [@Tiago](https://forum.dynamobim.com/u/Tiago)\ **Post date:** [June 27, 2021, 5:47pm UTC](https://forum.dynamobim.com/t/controlling-a-list-based-on-fluid-outflow-and-inflow/65574/1 "2021-06-27T17:47:38Z")
Good afternoon, below I have an image that demonstrates what do i need when output connectors are opposite the value is equal to 0, when they are perpendicular the value is 1 and lastly when there is no flow on one side the value is 2 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/6/e/6efa3e741e68f2ecb012b507cccb86509951afed.png) ---
**Author:** ![T\_Pover](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/t_pover/32/19147_2.png) [@T\_Pover](https://forum.dynamobim.com/u/T_Pover)\ **Post date:** [June 27, 2021, 9:03pm UTC](https://forum.dynamobim.com/t/controlling-a-list-based-on-fluid-outflow-and-inflow/65574/2 "2021-06-27T21:03:23Z")
Not exactly sure what you are trying to achieve, but these nodes might get you started: ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/7/e/7e203fbfaf75ab19ffc6c3ddd5da37374339a5f3.png) ---
**Author:** ![Tiago](https://avatars.discourse-cdn.com/v4/letter/t/f0a364/32.png) [@Tiago](https://forum.dynamobim.com/u/Tiago)\ **Post date:** [June 27, 2021, 9:33pm UTC](https://forum.dynamobim.com/t/controlling-a-list-based-on-fluid-outflow-and-inflow/65574/3 "2021-06-27T21:33:37Z")
I’ve already used these nodes but I don’t know how to check it can help me here rvt. [https://drive.google.com/drive/folders/1JLiJ0HW2nwRaxBC-dPPMShIlJWFrSRJb?usp=sharing](https://drive.google.com/drive/folders/1JLiJ0HW2nwRaxBC-dPPMShIlJWFrSRJb?usp=sharing) here dyn. [SETAR TEE COMPRIMENTO EQUIVALENTE.dyn](https://forum.dynamobim.com/uploads/short-url/vSVfhE6ojMO5N3kNZGaJtBw6ErF.dyn) (185.0 KB)