Bel-Art Polyethylene 6 in. Drying Tubes with Polypropylene Tube Fittings (Pack of 12) (F19961-0000)</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Unbreakable polyethylene straight tubes， 16mm ID by 19mm OD</li><li>Each tube is supplied with two polypropylene fittings which accept 6.4 to 9.5mm (1/4" to 3/8") ID tubing</li><li>Drying agent not included</li><li>Can be filled with desiccant of your choice</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/211PF%2BTyn6L.jpg' noproxy></br>