JOANLAB Glass Filterting Head For 1000 ml Vacuum Filtration Apparatus, Membrane Filter,Sand-Core Filter Equipment,Lab Glassware Classification: Laboratory Color: Transparent Height : 120 mm Diameter : 60 mm Diameter Sand Core : 40 mm Ground Joint : 40/38 International standard dimension fo 1000ml vacuum filtration apparatus Material : High borosilicate glass GG3.3 high borosilicate glass is also popular as hard glass, with excellent performance: low expansion ratio, high temp. resistance, high hardness, high transparency, high chemical stability.