SILCA EOLO IV CO2 Regulator Head — Green/Grey 90° Turn-Screw Inflator, Precise Control

The SILCA EOLO IV CO2 Regulator Head is a compact, 90-degree turn-screw inflator that gives precise control when using 16g or 20g CO2 cartridges on Presta and Schrader valves.

Engineered for cyclists who want a reliable, lightweight backup inflator, the EOLO IV blends an ergonomic 90-degree head with a knurled control valve and durable 6063 aluminum construction. It’s small enough to live in a saddle bag or jersey pocket yet robust enough for repeated roadside use. The regulator accepts standard CO2 cartridges and accommodates both smooth and threaded Presta stems as well as Schrader valves, making it a versatile tool for road, gravel, and commuter riders.

How does the 90-degree head improve handling and access?

The offset angle positions the cartridge and control away from the valve stem, offering a clearer line of sight and better hand clearance. That design reduces awkward bending and makes it easier to attach to valves in tight spaces such as deep-section rims or when wheels are still on the bike.

• 90-degree orientation for improved clearance and grip
• Compact footprint fits small storage spaces
• Helps align on deep rims and recessed valves

What materials and build features make it durable?

SILCA built the EOLO IV from 6063 aluminum for a balance of light weight and strength. The unit’s body and valve components resist corrosion and wear, while the knurled air control valve offers a confident tactile feel when metering flow.

• 6063 aluminum body and internal valve parts
• Knurled control for secure manipulation, even with gloves
• Precision threads compatible with common cartridge sizes

Which valve types and cartridge sizes are compatible?

The EOLO IV is engineered to accept both smooth and threaded Presta valves as well as Schrader stems, making it a universal solution across most bikes. CO2 cartridge threads match widely used 16g and 20g cartridges so you can use common brands available at bike shops and online.

• Fits smooth and threaded Presta valves plus Schrader
• Compatible with standard 16g and 20g CO2 cartridges
• Universal CO2 thread interface for easy cartridge swaps

How do you operate the turn-screw regulator safely?

Operating the EOLO IV is straightforward: keep the control closed, puncture the cartridge by threading it into the head, place the head on the valve, then open the valve slowly to meter gas. The turn-screw design lets you precisely start and stop flow to avoid overinflation and to fine-tune pressure.

• Start with control valve fully closed
• Thread cartridge until puncture; then seat on valve
• Turn counter-clockwise slowly to release CO2 in short bursts

Who this is for: The SILCA EOLO IV CO2 Regulator Head is aimed at cyclists who value compact, high-quality tools—road, gravel, and commuter riders who want a dependable, easy-to-operate inflator for quick roadside repairs. It’s also suitable for mechanics and cycling teams that need a precise, durable regulator for fast, repeatable cartridge inflation. If you prefer a small, metal inflator with tactile control and broad valve compatibility, the EOLO IV is designed to be a long-lasting addition to your ride kit.