DESIGN----This is a two-piece design vacuum cold trap,the connections on the uppper parts are with serrated hose connection,The center tube with 10mm hose connections for easy connection to a vacuum gas manifold bank tubes which are also with 10mm hose connections.The serration hose connection on the side tube have an O.D.of 13mm at the smallest serration and 16mm at the largest serration. The lower part is a thick wall round bottom tube with standard taper outer joint. USE----It is used to place between the experimental apparatus and the vacuum source. In a schlenk line,the vacuum trap is usually connected to the vacuum bank of the vacuum gas manifold DIMENSIONS-----This vacuum trap has 24/40 joints to assemble the two parts together, The O.D of the outer body is 30mm,the outer body below the joint is 200mm,the O.D.of the inner and side tube is 10mm. HEAVY WALL ---This lab glassware is heavy-wall designed , made by hand-blowing according to ASTM E438 ,made of high-quality borosilicate glass and annealed at 800 degree Celsius ,can be heated directly in an open flame and can withstand typical laboratory thermal variations in Chemistry processes like heating and cooling,durable and reusable. 100% 90 DAY MONEY BACK GUARANTEE If you are not satisfied for any reason, simply return for a full refund, no questions asked. You have nothing to lose.Please also kindly understand glassware is fragile, even if we pack them carefully,it may be broken during the shipment ,if you receive the items in broken status,don't hesitate to contact us ,we will arrange free replacement or full refund.