SeaSpray DC Nebulizer 0.4 mL/min, includes UniFit Connector with 0.5mm ID x 1.6mm OD x 700mm long tubing (1 piece) and DC Gas Fitting Type 31 with ratchet connector (1 pc.). Compatible with Thermo PRO, 6000/7000 Series ICP-OES.Optimum nebulizer gas flow rate is 0.7 L/min and sample flow rate is 0.4 mL/min. Recommended not to exceed optimum 0.4 mL/min sample flow rate; however, lower gas and sample flow rates are OK. The backpressure should read approximately 40 psi at 0.7 L/min gas flow rate. Can tolerate up to 20% TDS. We recommend the use of the Elegra Argon Humidifier to achieve best performance with high TDS.Replacement parts include P/Ns NC1625341 and 501907289.Recommend nebulizer maintenance tools are Fluka RBS25 (P/N NC9000117) and Eluo Nebulizer Cleaning Tool (P/N NC9462559). When nebulizer is not in use, best to store in the provided hard plastic case.Glass Expansion is ISO 9001:2015 certified by AB Certification, No. AU4501-9001