Double tube vacuum manifold with #15 o-ring joints at both ends. Available in either a 3 or 4 port configuration with 4mm bore glass double oblique stopcocks. The ports can be ordered in 14/20, 24/40 standard taper or #15 o-ring joints. The distance between ports is 210MM which allows for use of flasks up to 3 Liters. Please see our various o-ring joint adapters such as Ace codes 5127, 5128 and 5129.