Rain Bird WPCONN10 Waterproof Grease Cap Wire Connectors, 10-Pack

What It Is

The Rain Bird WPCONN10 is a 10-pack of waterproof grease-filled wire connectors designed to seal and protect low-voltage electrical splices in lawn irrigation systems. They’re used primarily on sprinkler valve solenoids and outdoor sensor wiring to prevent corrosion and moisture damage.

Fitment & Compatibility

• Wire gauge: Fits 18–22 AWG solid or stranded wire (common for irrigation valve solenoids).
• Application: Works with any 24V AC irrigation system—Rain Bird, Hunter, Orbit, Toro, and other brands.
• Installation requirement: Requires a standard wire nut or twist-on connector; these are not direct replacements for standard wire nuts—they’re added over a splice.
• Check before buying: Ensure your existing wire splice is already twisted or crimped. These caps seal the joint, not create it.

Key Things to Know

• Quality: Heavy-duty silicone grease inside prevents corrosion, even in direct-bury or wet conditions.
• Installation difficulty: Easy—twist the cap over an existing wire nut or splice until snug. No tools needed.
• Common gotchas:
  • Do not use on live wires—turn off the system first.
  • Not reusable once fully seated; buy extras if you make mistakes.
  • Works poorly on very thin (22 AWG) wire if the splice isn’t tight—cap may not grip.
• 10-pack value: Good for one or two valve boxes; large systems may need multiple packs.

Should You Buy It

If you’re repairing or installing outdoor irrigation wiring and want reliable, long-term protection against moisture and corrosion, this is a cheap, proven solution. Best for DIYers replacing worn solenoid connections or adding new valves—not for indoor or high-voltage use.