Genie
Primary: 1 5/8"
Secondary: 1 3/4"
Outlet: 2"
Pacemaker (Standard)
Primary: 1 1/2"
Secondary: 1 3/4"
Outlet: 2"
Pacemaker (Competition/Big Bore)
Primary: 1 5/8"
Secondary: 1 7/8"
Outlet: 2"
Motavator (MPH 603)
Primary: 1 1/2"
Secondary: 1 3/4"
Outlet: 2"Thanks Rhys & JamesR for this info... if anyone has other brands to add to the list please send me an email.