This Guardian Equipment AP450-032ORG ABS plastic shower head with 1-1/2" NPT female inlet is a standard replacement head for most Guardian showers. It is available in your choice of orange, green (AP450-032GRN), or yellow (AP450-032YEL).
To connect this shower head to a horizontal supply pipe you need both a 300-08SE galvanized street elbow and a 300-12-08HB reducing bushing. Prior to late 2017, this connection was made with a 330-12-08RSE-ORG which has been discontinued.
For metal shower heads see item # AP450-048.
A parts diagram for Guardian showers is also available.