Rain Bird 1804SAMP45 4-Inch SAM 45 PSI Spray Body — No Nozzle

Rain Bird 1804SAMP45 4-Inch SAM 45 PSI Spray Body — No Nozzle

Brand: Rain Bird | SKU: 1804SAMP45

Product Overview

Pair a suitable rotary nozzle with a 4-inch pop-up body that combines pressure control and low-head drainage protection. Rain Bird 1804SAMP45 has a built-in 45 psi regulator and a Seal-A-Matic check valve, making it a different choice from a standard 1804 or a 30 psi SAM-PRS body. The nozzle is selected separately.

Key Features

• Co-molded wiper seal helps resist grit intrusion.
• Stainless steel spring retracts the stem when the zone shuts off.
• Ratchet mechanism allows nozzle-pattern alignment by turning the stem.
• Internal components are accessible from the top for service.
• UV-resistant plastic and corrosion-resistant stainless steel components.
• Built-in 45 psi PRS regulator for suitable rotary-nozzle applications.
• SAM check valve helps retain water in lateral piping across elevation changes up to 14 feet.

Common Uses

• Rotary-nozzle layouts calling for 45 psi regulation at the spray body.
• Sloped zones where low-head drainage protection and pressure regulation are both needed.

Technical Specifications

• Merchant SKU: 1804SAMP45; manufacturer model: 1804-SAM-P45.
• Nozzle: not included; select separately for the required arc, reach and flow.
• Inlet: 1/2-inch female NPT; installation through bottom inlet only.
• Model-specific operating-pressure range: 25–70 psi.
• Pressure regulator target: average 45 psi outlet with adequate inlet pressure; the regulator cannot raise low supply pressure.
• SAM check-valve capability: holds up to 14 feet of elevation head.
• 45 psi is intended for suitable rotary nozzles; this is a different regulation target from 30 psi spray-body models.
• Coverage and flow depend on the installed nozzle and actual operating conditions.

Dimensions

• Body height: 6 inches.
• Pop-up height: 4 inches.
• Exposed surface diameter: 2-1/4 inches.

Compatibility & Installation Notes

Connect through the bottom inlet. Check finished grade, the 6-inch body height and clearance for the 4-inch pop-up stroke.

Measure operating pressure and confirm the supply can support the desired nozzle pressure and zone demand. A listed minimum inlet pressure of 25 psi does not mean a regulator can produce 45 psi from that lower supply.

Select a compatible Rain Bird nozzle whose pressure target suits the design. For a conventional spray nozzle calling for 30 psi, compare the corresponding SAM-PRS-30 model.

Flush before installing the nozzle and screen, align the watering pattern with the stem ratchet and follow the selected nozzle’s adjustment instructions. The SAM check valve addresses low-head drainage; it does not repair an upstream control valve that fails to close.

Frequently Asked Questions

How does this differ from a standard 1804?

1804SAMP45 combines a built-in 45 psi regulator with a SAM check valve. A standard 1804 body has neither feature.

Can it raise 25 psi supply pressure to 45 psi?

No. A regulator reduces available pressure; it does not boost pressure. The supply must provide enough operating pressure and flow for the desired nozzle performance.

How much elevation head can the SAM check valve hold?

Rain Bird specifies up to 14 feet of elevation head to help prevent low-head drainage after the zone shuts off.

Does it include a nozzle or accept a side connection?

No nozzle is included. This SAM-P45 model uses its 1/2-inch female NPT bottom inlet; the manufacturer specifies bottom-inlet installation only.

Why Buy from Big Frog Supply?

Choose 1804SAMP45 when the layout needs both a 45 psi rotary-nozzle pressure target and SAM drainage protection for up to 14 feet of elevation head. Its 4-inch pop-up stroke, 6-inch body and bottom-only connection help check replacement fit. Compare the 30 psi SAM-PRS model when using nozzles designed for the lower pressure target.