Do not use the plastic sleeve as it is only used for pex pipe applications. Gatorbite permanent fittings have had issues in the past. I have not heard anything negative about their removable fittings. I have used them with no problems to date.
Im not sure your application but I had great luck using Sharkbite fittings that I bought at HD. I have a straight fitting and a 90 degree fitting holding my master bath shower faucet. Theyve been there for about 6 months (not that long, I know) with no problems. Ive been told since they are accessible that they meet code as well but that very well may have been bull.
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