To be honest we are big advocates of carrying a pump but if you want a C02 inflator there is non better than this little beauty. Ultra compact (its the smallest spool valve regulator on the market) and is compatible with both Presta and Schrader valves.
The story of the Silca EOLO 3 C02 Regulator
In 1982 SILCA developed the first regulated CO2 inflator. As Claudio himself explained, 'Before EOLO, you had to turn the cartridge and pray!' Giving the user the ability to regulate the flow of gas into the tire was the key to widespread adoption of compressed gas for roadside use.
EOLO III builds on the SILCA tradition by using an ultra-precise spool valve design with light action spring to give the user perfect control of the flow into the tire. The full metal construction of the EOLO III contains no plastic parts and is manufactured entirely from 6063 series aluminum and stainless steel. Hardened tool steel puncture pin is more than 2X the hardness of traditional puncture pins to ensure smooth operation in all conditions over many years.
3 Insulating rings on the EOLO body improve grip and insulate from cold during inflation. EOLO III ships with Red-White-Red rings as well as one Blue and one Green ring to provide for customization of the regulator body. Other colors sold separately.