The 4-45 bioreactor vessel is manufactured from type 1 class a Borosilicate glass. This vessel has 4 sidearms around 100mm center neck. The stainless steel capseal has 5 ports for insertion of 12mm probes and 1/4" tubes. MADE IN THE USA. Specifications:Accepts All Standard Fittings And Probes316L Stainless Steel Cap Seal with compression fittings for probes/tube insertion.4 sidearms positioned 90° for increased capabilities.Accessories:1965-11400 Flask Only, 1L1965-60014 SST Cap seal, 1L, 5 port with IOB1965-13400 Flask Only, 3L1965-60034 SST Cap seal, 3L, 5 port with IOB1965-45200 45mm Plug w/Compression Fitting & Hose Barb.