Automatic Drain Sprinkler Valve
Automatic Drain Sprinkler Valve
Automatic Drain Sprinkler Valve

Part #: 51039

Automatic Drain Sprinkler Valve

  • For protecting irrigation pipes against freezing in colder climates
  • Pressure-activated seal closes when water is on and opens when water is off
  • Mesh filter allows water to discharge and prevents dirt from entering the sprinkler line
  • ABS construction with threads available in 1/2-in. and 3/4-in. MPT sizes
  • Compatible with Schedule 40 PVC 1/2-in. and 3/4-in. FPT tees and elbows
  • For watering trees, shrubs, perennials, or annuals of various heights
  • Combines an adjustable riser with a shrub adapter, spray nozzle and filter
  • Corrosion-resistant aluminum riser with locking nut adjusts from 16 to 36-in. or 22 to 36-in.
  • Adjustable pattern nozzle permits arc adjustment from 0 to 360 degrees
  • Shrub adapter allows for replacement with same or different pattern nozzle
  • Compatible with nozzles from Orbit, Hydro-Rain, and other major brands
  • Non-pressure-regulating, check local code for restrictions (pressure-regulating model is Orbit SKU 37355)
  • Low stock - 5 items left
  • Inventory on the way
Regular price$5.99
  • Free shipping over $35


The automatic drain valve or “auto drain” protects irrigation pipes from freezing in colder climates where that might be an issue. The auto drain has 1/2-in. or 3/4-in. male pipe threads (MPT) which thread into the outlet of a tee or elbow at the low point(s) of the piping for a zone. The auto drain has a seal which closes when the valve turns on and pressurizes the zone and opens when the valve turns off. This allows the line to be empty when the zone is not in use. However, this also means that the water from the zone— about 4 gallons in a 100-ft. section of pipe—will drain into the ground after each cycle, so you should only use drain valves where risk of pipes freezing during irrigation season is high or the system cannot otherwise be properly winterized at the end of the season. For outdoor irrigation use with cold water only.