The Gel Conversion Ring was developed by Aperture in an attempt to reverse the effects of its previous Gels. It is a metal hoop which swaps the type of the gel passing through it - as in 'bouncy gel goes in, sticky gel comes out', etc.
The gel types it converts are listed below:
Repulsion Gel > Attraction Gel (and vice versa)
Propulsion Gel > [TBA GEL TYPE] (and vice versa)
Conversion Gel > [TBA GEL TYPE] (and vice versa)
SPOILER: There may be at least two new gels, as well as the Attraction Gel. PLEASE DON'T PM ME ASKING FOR YOUR GEL TO BE INCLUDED!
Also, we are working on the Attraction Gel. With some help from reepblue, we have realised there is probably no way to make it completely mimic the effect in TAG - but we will do our best. It will still stick.
UPDATE: This article has got Enhancement featured on modding podcast Podcast17!