The 100mm hydrolet valve is designed to be used a secondary manual external stop valve fitted directly to the pipeline or manifold of the tanker. The spindle assembly can be easily removed with its quick release clamp ring for easy cleaning of the valve body and to perform maintenance on the packing in the gland box and PTFE main seal without removing the entire valve from the tanker. The internal seals in the gland box can be compressed to compensate for wear and tear by way of external adjustment – even when the tank is fully loaded.