Comparison : Item # 09R813B, 09R Regulator - Hi-Flow
Item # 09R813BA, 09R Regulator - Hi-Flow
Item # 10R115P, 10R Pilot Controlled Regulator Economy
Item # 10R215P, 10R Pilot Controlled Regulator Economy
Item # 10R121P, 10R Pilot Controlled Regulator Economy