Microscale Claisen adapter/head often used to facilitate syringe addition of reagents to sealed or moisture-sensitive systems. With inner joint at bottom and two outer joints externally threaded for an O-RING-CAP-SEAL connection with mating male joints. Supplied with two threaded caps with hole, two PTFE-faced silicone rubber septa and two O-Rings. For replacement caps, see 9590-45, -46, -47; for septa, see 8787-41, -42, -43; for O-Rings, see 7855-705, -706, -720.