... laboratory 2. silent working, compressor inside. 3. 0--2L/min, 4bar pressure. SS tan pure air pump character:1. High precision output ... protection, low voltage start up, DC, greatly protect inside compressor.7. Have have GCK3308 and A-10 model 0--8L ... noisy, auto water drain. Stainless steel tank, stable pressure, compressor inside, work with GCTechnical Data Model SPB-3GCK3302Output Flow0--2L ...