This item is priced per foot and does not include an adaptor.  Tubing has an inside diameter of 1/4" and outside diameter of 3/8". To help outgas or clean tygon tubing, bring distilled water and baking soda to a boil. Remove from heat and insert tubing. Let stand for an hour. Air dry. Repeat if necessary. Sorry, no returns.  Please specify # of feet required in quantity box. 

$3.54