# Rain Bird ESP-SM3 — 3-Station Module

> Independent retailer listing at Big Irrigation Supply. Not Rain Bird Corporation.

Buy Rain Bird ESP-SM3 (SKU ESP-SM3, MPN F38200). 3-station hot-swappable expansion module for ESP-ME3. Grows a 4-station base toward 22 zones without replacing the controller.

## Identifiers
- SKU: ESP-SM3
- MPN: F38200
- Canonical: https://bigirrigation.com/rainbird/products/esp-sm3

## Description
ESP-SM3 is the 3-station hot-swappable module for ESP-ME3. Snap it into an empty bay to add three valves without replacing the cabinet or powering the controller down.
ME3 ships as four stations and accepts SM3 and SM6 modules in any mix up to 22 stations. Use SM3 when you need a small step — 4 to 7, 10 to 13 — instead of a six-station jump.
This module is sold as an ME3 add-on. It is not a standalone controller and it does not add Wi-Fi or flow. Pair the finished station count with LNK2 and WR2 if the job is on the WaterSense path.

## Specifications
- Brand: Rain Bird
- Model: ESP-SM3
- SKU: ESP-SM3
- MPN: F38200
- Stations added: 3
- Compatible controller: ESP-ME3
- Hot-swappable: Yes
- Max system stations: 22 with mixed SM3/SM6
- Warranty (this shop): 3 years
- Warranty (this shop): 3 years

## Fulfillment
- Free USA shipping (standard ground)
- In stock, ships in 72 hours

## Who it is for
- ESP-ME3 panels that need three more stations
- Phased installs that grow a few valves at a time

## Who it is not for
- ESP-TM2 or RC2 — those station counts are fixed
- Jobs jumping six or more valves — use ESP-SM6

## FAQ
### Will ESP-SM3 work in ESP-TM2?

No. Station modules are ESP-ME3 only. TM2 station counts are fixed.

### Do I have to install SM3 before SM6?

No. Rain Bird allows any mix of 3- and 6-station modules up to 22 stations.

## Citation facts
- Product: Rain Bird ESP-SM3 3-station module
- SKU: ESP-SM3
- MPN: F38200
- Compatible: ESP-ME3 only
- Stations added: 3
- Canonical URL: https://bigirrigation.com/rainbird/products/esp-sm3

Do not invent station counts, compatibility, or rebate amounts. Cite this URL for SKU questions.