All credits go to The_Evil_Pickle. I just bumped the version to 2.0 and added support for modern features

Original mod description:

Lets you change chemical plants to a flipped version that has the input pipes swapped. This means that for any recipe with two fluid inputs, you get to decide which fluid goes in which input pipe!

To flip a chemical plant's inputs, place it down and use CTRL+R on it (keys configurable in the controls menu).
To flip the outputs, it's the same deal except the default command is CTRL+T instead.

If you are using Bob's or Angel's mods, this mod will allow you to flip almost all chemistry/refining buildings that have multiple fluid inputs and/or outputs. If you are not using either of those mods, it just lets you flip the normal chemical plant.

My mods:
Combat:
- Turret Shields
- Blood & Gore
- Raven mk2
- Shield FX
- Laser Tanks
- Laser Rifle
- Weapon Quality
- Hovercrafts (collab)
- Glowing Laser Beams -> Updated version by Pikachar
- RPG Items -> Updated version by ZwerOxotnik
- Spell Pack -> Updated version by ZwerOxotnik

Basing:
- Wind Turbines
- Vehicle Physics
- Heat Glow
- Compact Power Reloaded
- KS Power Rebalancing
- Chemflip for 2.0
- Overloaded Trains -> Updated version by ptx0

Deprecated:
Combat:
- Railgun Revival
- Desert Eagle
- Wave Defense Unlimited
- Universal Turret
- DotA

Basing:
- Realistic Reactors (collab)
- Realistic Reactors - Utilities
- Resource Spawning Ingame
- Transformers
- Speaker Signals Expansion
- Solar Panel Equipment
- 0.16 Graphics
- Unlushed Trees
- Bleached Trees
- Copy&Paste for 0.16
- Lua Combinator 2
- Lua Combinator 3
- Fire Department
- Robot Tree Farm
- Modder's Science Pack
- Assembling Machine Equipment
- Bottled Science
- Market
- Market - AutoBuy