Rain Bird - LFV100 - 1" DV Low Flow Drip Irrigation Valve 224079PP What is the difference between

What is the difference between the two variants

Screened vents

Right bowl: 14-9/16 inches long x 16-1/8 inches wide x 9-1/2 inches deep

Four AAA alkaline batteries

Rain Bird - LFV100 - 1" DV Low Flow Drip Irrigation Valve 224079PP What is the difference betweenSpec Sheet *One Solenoid Handle Per Order 1 in. Low Flow Drip Irrigation Valve Unique "double knife" diaphragm coupled with 1 2 in. diameter seat for flawless operation at low flow rates Double filtered pilot flow design for maximum reliability External bleed to manually flush the system of dirt and debris during installation and system start up Internal bleed for spray free manual operation Valves designed exclusively for the low flow rates of a drip