Brass valve bodies are the clamp-in type of tubeless valve, fitted through the rim hole and tightened down with a nut rather than pulled through like a rubber snap-in valve. They are the pattern used on truck, tractor and alloy wheels where the valve has to be held solidly.
The page shows six types together: a long bent-neck stem, a shorter right-angle stem, two straight threaded stems of different lengths, and a heavier large-base stem with a knurled body. Each has the brass threaded stem, a knurled or hex nut, a sealing washer and a base seal, so the valve seals against the rim on both faces when tightened.
The stems are threaded at the top for a standard valve core and cap. Sold under item codes AF-046 to AF-051 as separate types so a workshop can order the neck shape and stem length that suits its wheels. Made in India by Alfon Taps Ltd under the Air Flow brand.