UniFit Connector with 0.75mm ID x 1.3mm OD x 700mm long tubing sample tube. Package of 10 replacement sample lines. Compatible with Glass Expansion U-Series and DC Series Nebulizers. Used to carry sample from peristaltic pump tubing or mixing T to nebulizer. This consumable part should be replaced at a frequency of about every 6 months to ensure optimum sample flow.UniFit Connector with 0.18mm ID, 1.3mm OD x 700mm long sample tube, NC1973499. For UniFit Connector with 0.25mm ID, 1.3mm OD x 700mm long sample tube, NFT-025. For UniFit Connector with 0.5mm ID, 1.3mm OD x 700mm long sample tube, NC1625341.Glass Expansion is ISO 9001:2015 certified by AB Certification, No. AU4501-9001