Some competing manufacturers highlight their use of imported Leafield valves, you use Halkey Roberts. Why?
Earlier Halkey Roberts valves had their problems. Poppet valve ends and valve caps came off. There were high rates of leakers. Some manufacturers committed to Leafield at this time. In the late 90’s Halkey Roberts re-tooled and their later valves have given no troubles that we are aware of. In the event of deterioration due to age or grit damaging the sealing surfaces these valves are easily and inexpensively replaced. They are almost a flush fit with the tube surface, reducing the likelihood of knocking a knee or leg against them. They clamp the material better and provide a long term better seal.