Electronic Digital Water Timer (YL21178)

• Run time can be set at 1-360 minute.

• Frequency can be set at 1hrs. 2hrs- 3 hrs- 4 hrs- 6 hrs-12hrs. 1-15days.

• or taps with 26.5mm(G3/4)

• 2 x AA alkaline batteries required (not included)

Why Choose the YL-21178?

• Dual Outlet Control: Two valves (left & right) let you water two separate garden lines from one timer — perfect for lawn plus drip irrigation.
• Three Programs: Set up to 3 independent schedules (P1, P2, P3), each with its own start time, duration, and frequency.
• Rain Delay: Pause watering for 6/12h or 1–7 days after rain to save water and protect plants.
• Tool-Free Install: Standard 3/4" tap threading and 2×AA battery power — wire-free, connect by hand in seconds.

Product Features

3 Programmable Schedules — Programs P1, P2 and P3 each store a start time, watering duration, and frequency. Switch between them with the OK button during setup.

Left / Right Valve Switching — Press the Z button to assign a program to the left or right valve, so two outlets run on their own timing.

Flexible Watering Schedules — Run time 1–360 minutes. Frequency 1–23 hours or 1–15 days (frequency applies per program, not per valve).

Clear Backlit LCD Display — Shows P1/P2/P3, current time, next start/delay, battery level, valve, and mode icons at a glance.

Manual, Auto & Off Modes — Run saved programs automatically, trigger on-demand manual watering (1–360 min), or switch to OFF to stop everything.

Technical Specifications

How to Program in 5 Steps

• Install Batteries: Open the battery cover on the back, insert 2 × AA alkaline batteries, then close firmly. The LCD fully illuminates for 2 seconds and defaults to 12:00 PM.
• Set the Clock: Rotate the dial to SET CLOCK. Use + / – to set the current time, then rotate the dial to confirm.
• Set Schedule (P1 / P2 / P3): For each program, rotate to START TIME, HOW LONG (1–360 min), and HOW OFTEN (1–23h or 1–15 days). Press OK to confirm and move to the next program. Press Z to switch the left/right valve for start time and duration.
• Run & Rain Delay: Rotate to RUN to start the schedule. Press + in RUN to set Rain Delay (6/12h or 1–7 days); press + again or rotate the dial to cancel.
• Manual & Off: In RUN, press OK for on-demand manual watering (1–360 min, switch valve with Z). Rotate to OFF to disable all programs.

Pro Tip: Frequency (HOW OFTEN) is set per program (P1/P2/P3), not per valve. Start time and duration can be assigned to the left or right valve using the Z button. Long-press the – button for 3 seconds in RUN to enable the child lock.

Frequently Asked Questions

Q: What does "dual outlet" mean?

A: The YL-21178 has two valves (left and right). You can water two separate lines — e.g., a sprinkler and a drip line — each on its own timing.

Q: How many schedules can I set?

A: Up to 3 independent programs (P1, P2, P3). Each stores start time, duration, and frequency. Switch the valve with the Z button.

Q: Will this fit my outdoor faucet?

A: Yes. The inlet is a standard 3/4" (G3/4, 26.5 mm) thread for common garden taps; both outlets are 3/4" external thread.

Q: What does Rain Delay do?

A: It pauses watering for 6/12 hours or 1–7 days after rain to avoid over-watering. Press + in RUN mode to set or cancel.

Q: Is there a child lock?

A: Yes. In RUN mode, long-press the – button for 3 seconds to lock the panel; long-press again to unlock.

Q: How long will the batteries last?

A: A pair of AA alkaline batteries typically lasts a full season. A low-battery icon appears when replacement is needed.

Q: Is it safe to leave outside?

A: Yes. The housing is water-resistant with a sealed battery compartment. Keep the cover closed and remove batteries if unused long-term.

Ready for Smart Dual-Zone Watering?

The YL-21178 gives you flexible, automated control of two garden lines from one compact, battery-powered device — set it once and enjoy a healthier landscape all season long.