Tracey PTFE spray chamber, includes Helix CT locking screw & seal (1 pc) & UniFit with 1.6mm OD x 0.75mm ID x 700mm long tube (1 pc). Made from PTFE for HF resistance, 50mL volume. Compatible with Thermo PRO Duo/Radial & 6000/7000 Radial.The Tracey PTFE is a HF-resistant cyclonic design with a proprietary Stediflow surface treatment that significantly improves sensitivity & precision, in addition to enhancing washout efficiency compared to other inert spray chamber designs. The interior surface can be refurbished at a nominal cost, average lifespan of treatment is 12 months when well cared for.The main feature of the Helix CT interface is the built-in, ratcheting torque control mechanism that allows for a consistent, zero dead volume & chemically inert seal of the nebulizer.Replacement parts include NC1943061, NC2081825 & V-044, suggested to replace every 6 months.Glass Expansion is ISO 9001:2015 certified by AB Certification, No. AU4501-9001