The Labconco 750ml Complete Fast Freeze Flask features a 3/4" flask top adapter diameter
Attach to valve ports on Labconco manifolds and drying chambers with glass or stainless steel adapters, such as a 1/2" to 3/4" Glass 45° Adapter or 3/4" Stainless Steel Straight Adapter
These flasks and adapters are compatible with all freeze dryers with 1/2" or 3/4" diameter valve ports, no matter the brand
Catalog # 7541100, Flask Top # 7544400, and Flask Bottom # 7542700