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Yes, I've done it. The toughest part was getting the plastic "Y" sealed up to the plastic Opti cap, the 10$ soldering iron I bought got a workout. I wanted to make sure it was sealed, so holding my finger over the end of the "Y" I would fill the cap up with water, finally after about 6 tries I got it to hold water, no drips .
This Opti has about 9k miles on it and the seal was already cracked at the bottom, so I replaced them with (sensor safe) RTV.
Here are a couple of pictures of the finished product. http://www.digitalcorvettes.com/phot...optivent01.JPG