PORCELAIN TUBE

A tube is used in knob and tube wiring to allow the wires to go through a wooden beam.   The tubes come in varying lengths between 3" and 6.75" We don't always have all forms of tubes.  When we are out of stock of a particular type of tube, the option should be grayed and crossed out.  Give us a call to see if we are really out of the type you want.  Sometimes the computer counts are not always accurate. We have a full description of knob and tube wiring and Wikipedia's knob and tube wiring page has great pictures of knob and tube installations. Condition New Old Stock If we find tubes that have never been used we call them new old stock.  They're in new, never-used condition but they were made decades ago.  We almost never find these, but very occasionally will come across some. Good Tubes classified as good may have slight chips, a little dirt. Fair Tubes in fair condition are still functional, but may have larger chips but no major breakage, and can have significant dirt, marks, and