Model Z1: For 1 1/4" and 1 1/2" single stem and 2" and 2 1/2" double stem.
Model Z2: For 1 1/4" and 1 1/2" single stem, 2" and 2 1/2" double stem and 1 1/2" turbo tube.
Model Z3: For 2", 2 1/2", 3" and 4" single stem and 3" and 4" double stem.
