The top dome, moulded in rigid and transparent Poly carbonate, gives a crystal clear view of desiccant placed inside.

 The Knurled knob on the top provides easy handling of dome. The lower part is made of Polypropylene.

 An internal groove is provided on the flange to hold a silicon rubber O-Ring. 

The Polypropylene stopcock is fitted with a self lubricating PTFE plug. 

This plug works three way i.e. vaccum creation, shutting off & vaccum releasing.