I am installing a 20amp single post breaker to run my air compresssor and was wondering what 20amp receptacle I should use. It will be in my garage and I am wanting to have two receptacles on the same line. I also was wondering if I use the first receptacle as a junction for the second or use a pigtail for the junction? I will be grateful for any help. :confused:

Pigtails are always better. Use higher quality receptacles like from Hubbell from a supply house rather than the $0.62 cent variety.