Is it time to replace your race suit? Let’s get you track-ready. 
The Sparco single seater plumbed in fire system, 0.9 litres. Part number 014772FEAL.
Homologated for open cockpit single seater cars, and the specification follows from that. An aluminium bottle rather than steel, at 0.9 litres rather than the two and a half or four you would put in a saloon, because a single seater has no cabin to fill and every gram counts.
Approved to FIA Technical List 16 and filled with AFFF foam based extinguishant, which is effective on fuel fires.
Why the capacity is smaller
An open cockpit has nowhere for fire to be contained, so the system is protecting the driver and the immediate area rather than filling a cabin. A bigger bottle in a single seater is weight and packaging you cannot spare for protection you do not gain.
Before you order
Check what your regulations specify. Technical List 16 is accepted widely and not universally, and some series now require FIA 8865-2015 instead. Formula regulations are also specific about actuator position and about the external pull a marshal has to be able to reach.
Packaging in a single seater is tight. Tell us the car and we will work through where the bottle and the plumbing can go before you buy, rather than after you have discovered it will not fit.
