Welcome to the forum. Yes, there is an o-ring in there and its a leaker on many filter heaters. The cost about $2.00 at International so just don't try to buy this at ford. They will charge you an arm and a leg if they have it. Buy two and keep a spare. It will leak in the future. To get this out you remove the filter. Then remove what the filter screws on to. Then just push out the fitting from the top. You can buy a new heater id needed on ebay for around $70.00. I will post what it looks like later...