#RACK15 - UL Listed 1½" rack only. Contact us for current approvals.
#RACK25 - UL Listed 2½" rack only. Contact us for current approvals.
#RACNIP15-1 - 1½" Male NPT x 1½" Male NST rack nipple only
#RACNIP25-1 - 2½" Male NPT x 2½" Male NST rack nipple only