Rain Bird 1804 4-Inch Pop-Up Spray Bodies — SAM or PRS
Brand: Rain Bird | SKUs: 1804SAM, 1804PRS
Product Overview
Replace a 4-inch pop-up spray body with the feature your zone needs. The 1804SAM adds a check valve to help stop low-head drainage; the 1804PRS regulates higher pressure to a nominal 30 psi at the nozzle. These are two separate choices. Neither listed option combines SAM and PRS, and both require a separate watering nozzle.
Key Features
- 4-inch pop-up height for spray layouts that do not need a taller riser.
- 1804SAM helps retain water in lateral piping with up to 14 feet of elevation head.
- 1804PRS helps control excess nozzle pressure.
- Ratcheting stem supports pattern alignment; top-access components aid maintenance.
Common Uses
- Replacing compatible 4-inch spray bodies in lawn or planting zones.
- Low points in a sloped zone with the SAM option.
- Higher-pressure spray applications with the PRS option.
Technical Specifications
- Available models: 1804SAM and 1804PRS; no watering nozzle included.
- Inlet: 1/2-inch female NPT; bottom inlet installation.
- 1804SAM: built-in SAM check valve, up to 14 feet of elevation head; 25–70 psi operating range; no pressure regulation.
- 1804PRS: nominal 30 psi in-stem pressure regulation; 15–70 psi operating range; no SAM check valve.
- Radius, pattern and flow are determined by the separately selected nozzle.
| Model |
Pressure regulation |
SAM check valve |
Inlet installation |
Operating pressure |
| 1804SAM |
None |
Yes; up to 14 ft head |
Bottom only |
25–70 psi |
| 1804PRS |
30 psi nominal |
No |
Bottom only |
15–70 psi |
Dimensions
- Pop-up height: 4 inches.
- Body height: 6 inches.
- Exposed surface diameter: 2 1/4 inches.
Compatibility & Installation Notes
Match the selected model to the required feature and connect at the bottom inlet. Choose a compatible Rain Bird spray nozzle separately and flush debris from the body before nozzle installation.
SAM controls low-head drainage after shutoff; it is not a pressure regulator. PRS reduces excess inlet pressure and cannot raise low supply pressure. Gallery illustrations include a SAM-PRS cap and a nozzle; the available choices here are SAM-only or PRS-only bodies without nozzles.
Frequently Asked Questions
Does 1804SAM include pressure regulation?
No. It includes the SAM check valve for low-head drainage control. Select 1804PRS when you need nominal 30 psi pressure regulation.
Does 1804PRS also include the SAM check valve?
No. These listed options provide either SAM or PRS. A model specified as SAM-PRS is a separate combination model.
What are the body and pop-up heights?
The body is 6 inches high, with a 4-inch pop-up height. The exposed surface diameter is 2 1/4 inches.
Are nozzles included with these bodies?
No. Choose a compatible nozzle separately to match the watering radius and pattern.
Why Buy from Big Frog Supply?
Choose the 1804SAM when a 4-inch pop-up sits at a low point where drainage is the concern; choose the 1804PRS when excess nozzle pressure is the concern. Both use a 1/2-inch NPT bottom connection and a 6-inch body, making the feature choice clear when planning a replacement.
Available models: 1804SAM and 1804PRS; no watering nozzle included.
Inlet: 1/2-inch female NPT; bottom inlet installation.
1804SAM: built-in SAM check valve, up to 14 feet of elevation head; 25–70 psi operating range; no pressure regulation.
1804PRS: nominal 30 psi in-stem pressure regulation; 15–70 psi operating range; no SAM check valve.
Radius, pattern and flow are determined by the separately selected nozzle.
