Comparison : Item # LV004403Y4, LV4403Y Series 1/2" Inlet Connection Size and 1/2" Outlet Connection Size Second Stage Regulator for 2 PSI Systems
Item # LV004403Y46R, LV4403Y Series 1/2" Inlet Connection Size and 3/4" Outlet Connection Size Second Stage Regulator for 2 PSI Systems
Item # LV005503Y6, LV5503Y Series 3/4" Inlet Connection Size and 3/4" Outlet Connection Size Second Stage Regulator for 2 PSI Systems
Item # LV005503Y8, LV5503Y Series 3/4" Inlet Connection Size and 1" Outlet Connection Size Second Stage Regulator for 2 PSI Systems