DuraMist U-Series Nebulizer 0.4mL/min, includes UniFit Connector with 0.50mm ID x 1.6mm OD x 700mm long tubing (1 pc) & EzyLok Connector (1 pc).Optimum nebulizer gas flow rate is 0.7L/min & sample flow rate is 0.4mL/min. Recommended not to exceed optimum 0.4mL/min sample flow rate; however, lower gas & sample flow rates are OK. The backpressure should read ~40 psi at 0.7L/min gas flow rate. DuraMist is an economical inert nebulizer for high-precision analysis & the highest tolerance to TDS, up to 30%. Made from PEEK, tolerates up to 5% HF.Replacement parts include P/N 502702959, EL-1 & 501907289.Recommend nebulizer maintenance tools, Fluka RBS25 (P/N NC9000117) & Eluo Nebulizer Cleaning Tool (P/N 501907353). When nebulizer is not in use, best to store in the provided hard plastic case.Consider upgrading to our new Direct Connect (DC) DuraMist to take advantage of the cost-effective design improvements.Glass Expansion is ISO 9001:2015 certified by AB Certification, No. AU4501-9001