Injection lance for use with Prominents range of dosing and metering equipment. These injection lances allow for variable immersion depth into a pipe with a large cross section preventing chemical desposits at the point of injection. They are fitted with s stopcock and allow an immersion depth of between 20 to 130mm. The lances consist of a spring loaded injection valve, adjustable immersion rod and a hose valve. Connectors allow the fitting of all hose sizes used with prominents metering and dosing pump products