Quark pilot plant reactors in 10 and 20 Liter volumes are available complete or by individual components. Each cylindrical reactor is available with or without a cooling or heating jacket with 1" beaded pipe connectors for fluid circulation to the jacket, a 5-neck 200 mm reactor head with 45/50 center, 1-45/50 side and 3-29/42 side ports, a quik-release clamp with a silicon o-ring, a removable 22 mm no-hold up bottom drain valve with KALREZ o-rings and a 1" beaded pipe take-off for drainage or fluid transfer. Each reactor also is available with a stainless steal support rack, powerful overhead stirrer with a controller, a stirring system with a 19 mm polished stirring shaft, teflon stirrer bearing and J-Kem temperature monitor with a teflon probe. In addition, these systems include a coiled condenser with a jacket and internal threaded adapters as needed. Additional accessories are available including solid or liquid addition funnels, offset adapters, thermowells, aspirators and stoppers. Optional Air-driven stirring motors are available upon request.