Sounds like you are talking about RG8X with an adaptor. Here is a link with text and photos that works. There are a lot of ways to do it. Some don't call for solder when using an adaptor with the pl259. I use this method only for indoor jumpers. I like to solder the outdoor coax. Many hams do it several different ways and most will work. The link I am sending you is a good one but not the only one. http://www.mgs4u.com/Connector-PL-259-guide.pdf
This covers both the RG8 and the RG8X types with adaptors.