A: Yes, there are a variety of 1” pipe options available at the store. However, if you are connecting under a typical vertical pressure tank, I think you really should be looking at a 10” tank tee. Search model EBTC10NL.
A: Yes you can buy a brass nipple or just use pvc schedule 40
A: No this is a standard NPT threaded tank tee. However, you may be able to find a quick connect adapter for your tank to make this work.
A: Yes. The tee is dual threaded with female 3/4” female and male 1” threads. Use the appropriate fittings as needed with thread tape or sealant that is approved for use with PVC, as it is easy to overtighten PVC fittings.
A: Yes you can with the right fittings. Should be an easy installation.