These are black iron pipe male insert, barbed hose end adapters. Made from standard black iron pipe, not the thin wall pipe you usually find these in. This fitting is 6 1/4" in overall lengthThreaded end is 2" long and 1 1/4" (1.25") diameter with standard NPT threads.
A Buchi RE 121 Rotavapor with condenser flask for nipple insert. This item does show signs of cosmetic wear from previous use. However, the operational condition of the item is still in excellent condition.
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