The K-Rain PRO-EX3 4-Station Module (3304) is a convenient expansion solution designed to increase the capacity of the PRO-EX3 modular irrigation controller. Engineered for flexibility and ease of installation, this module allows contractors and property managers to quickly scale irrigation systems as landscape demands grow.

Designed to integrate seamlessly into the PRO-EX3 platform, the 3304 module adds four additional stations, enabling precise zone control without the need to replace the controller. Multiple modules can be added to expand conventional wiring capacity, with the PRO-EX3 system supporting up to 24 modular stations—or up to 40 stations when combined with 2-wire technology.

The module supports the PRO-EX3’s advanced feature set, including FlowLogic™ monitoring, Adaptive Irrigation Mode (AIM), and full program display, ensuring consistent performance across all zones. Whether upgrading an existing system or planning for future expansion, the 3304 module provides a simple and cost-effective way to extend irrigation control.

Key Features & Benefits

• Adds 4 Stations – Expand system capacity quickly and efficiently
• Modular Flexibility – Easily integrates into PRO-EX3 controller platform
• Scalable Design – Combine multiple modules for up to 24 conventional stations (To get to 24-Zone, 3 of the 3308 modules must be purchased and then you will remove the 4-station base module that comes with the controller)
• Supports Hybrid Systems – Works alongside 2-wire expansion for up to 40 total stations
• Simple Installation – Designed for quick, internal controller integration
• Future-Ready Expansion – Grow irrigation systems without replacing hardware