Pentair R172008W White， Threaded Cap Replacement Rainbow Automatic Chlorine/Bromine Pool and Spa Feeder<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Threaded cap replacement</li><li>Fits Pentair Rainbow automatic chlorine/bromine pool and spa feeder model 300， 302， 300-29X， 320， 322</li><li>Available in white color</li><li>3inch refers to the size of the pipe thread on the interior of the cap not the size of the cap itself.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31f0mKkL-pL.jpg" noproxy>