Temperature resistant from -40°,C upt o 120°,C Butyl as a synthetic rubber has good chemical properties (cleanliness)  , Further Screw Seals ND8 with closed/open top resp. with white Caps are available upon request!  , This product is an alternative to the products (SKU) of these brands: Agilent:- Waters:- Chromacol:- National Scientific:- Wheaton:- Finneran:- SUN/SRI International:Meer tonenMinder tonen