Jumbo Soxhlet extraction apparatus equipped with a Duran flange at the top of the extractor. Flange is formed with a groove in the flat portion of the mating surface to accept a Teflon covered silicone o-ring to permit grease free assembly. The adapter between the condenser and extractor has a top outer joint and a Duran flange, which attaches to the extractor body with a stainless steel clamp. Complete apparatus consists of a condenser, extractor, round bottom flask, adapter, Teflon covered o-ring and clamp. Teflon sleeves and heating mantles must be ordered separately.