A spray body is the part of a pop-up irrigation sprinkler that sits below ground and raises the nozzle when the zone is pressurized. It may look like a simple housing, but choosing the correct replacement requires checking pop-up height, inlet size, nozzle configuration, check-valve requirements and the exact model being replaced.
One of the most important distinctions is also one of the easiest to miss: some products are sold as a spray body only, while others arrive as a preassembled spray head with a nozzle already installed.
The table below summarizes the main selection points.
| What to check | Why it matters |
|---|---|
| Pop-up height | Determines how far the riser lifts the nozzle above the surrounding surface |
| Inlet size | Must match the irrigation connection below the sprinkler |
| Body only vs preassembled | Determines whether a nozzle is already included |
| Check valve | Can help reduce drainage from lower heads after a zone shuts off |
| Nozzle interface | Determines which nozzles can be fitted to the spray body |
| Pressure requirements | Influence spray performance and whether regulation is useful |
| Existing model | Often provides the safest starting point for a replacement |
What does pop-up height mean?
Pop-up height describes how far the sprinkler stem rises above the body when the irrigation zone is operating.
A 4-inch / approximately 10 cm pop-up, for example, raises the nozzle about four inches above its retracted position. Hunter identifies the PROS-04 as its 10 cm Pro-Spray model, while Rain Bird's 1804 is its 4-inch 1800 Series body. Hunter Industries
The correct height depends on the installation. Turf areas generally need the nozzle to rise sufficiently above surrounding grass so the spray pattern is not obstructed, while other landscaped areas can have different requirements.
A taller body should not automatically be considered an upgrade. The goal is to match the sprinkler height to the site and existing design.
For a common body-only example, Flow Supply Store carries the Hunter PROS-04 Pro-Spray Spray Body with a 10 cm pop-up and 1/2-inch inlet.
Spray body only or nozzle included?
This distinction should be checked on every SKU before ordering.
A body-only spray head gives the installer flexibility to select the required nozzle separately. This can be useful when the same spray body is used across a project with different radii and arcs.
The Rain Bird 1804R 4-inch Spray Body is one example. Rain Bird identifies the 1804R as a 4-inch pop-up body supplied without a nozzle.
Flow Supply Store also carries the smaller Rain Bird 1802R 2-inch Spray Body.
By contrast, some products arrive with the nozzle already selected and installed. Hunter's PS Ultra products in the Flow Supply Store catalog include configurations such as the Hunter PSU-04-10A-NFO, which combines a 10 cm spray body with a factory-installed adjustable 10A nozzle. The current product listing identifies the nozzle as part of the assembly rather than a separate purchase. Flow Supply Store
That makes the complete SKU important. Ordering a preassembled model when you intended to choose a separate nozzle can give you a different radius or arc configuration than expected.
Why does the check valve matter?
After an irrigation zone shuts off, water remaining inside lateral piping can sometimes drain through sprinklers installed at lower elevations.
A spray-body check valve is intended to reduce this low-head drainage.
Hunter's Pro-Spray range offers check-valve versions, and the manufacturer's specification builder distinguishes the standard PROS-04 from check-valve variants such as PROS-04-CV. Hunter states that the check-valve option is intended to prevent drainage at lower heads. Hunter Industries
Flow Supply Store therefore carries these as distinct products:
Hunter PROS-04 — standard 10 cm spray body
Hunter PROS-04-CV — 10 cm spray body with check valve
The CV designation matters. A standard body should not be assumed to provide the same drainage control simply because it belongs to the same Pro-Spray family.
A check valve is especially worth checking when replacing sprinklers on sloped terrain or on zones where water continues draining from the lowest sprinkler after shutdown.
Pop-up height and nozzle radius are different specifications
A common source of confusion is treating spray-body height and spray radius as if they describe the same thing.
They do not.
Pop-up height describes the vertical movement of the sprinkler stem.
Nozzle radius describes how far the selected nozzle is intended to throw water under its specified operating conditions.
A 4-inch spray body could therefore be paired with different nozzle radii, assuming the components are compatible.
Hunter's PS Ultra products make the distinction particularly visible. Flow Supply Store currently carries several 10 cm PS Ultra assemblies with different factory-installed adjustable nozzles:
| Product | Pop-up height | Included nozzle / nominal radius |
|---|---|---|
| PSU-04-10A-NFO | 10 cm | 10A / approximately 3 m |
| PSU-04-12A-NFO | 10 cm | 12A / approximately 3.5–3.7 m |
| PSU-04-15A-NFO | 10 cm | 15A / approximately 4.6 m |
| PSU-04-17A-NFO | 10 cm | 17A / approximately 5.2 m |
The spray body stays in the same general size class while the nozzle changes the watering pattern and radius. The current Flow Supply Store listings confirm the separate factory-installed nozzle configurations. Flow Supply Store
When a body-only spray head makes sense
A body-only spray head is useful when the installer already knows which nozzle family and pattern will be fitted.
This approach separates the two decisions:
spray body → installation hardware
and
nozzle → radius and spray pattern
Rain Bird's 1800 Series follows this approach extensively. Its standard 1800 bodies are designed for compatible Rain Bird spray nozzle families, while the nozzle can be selected according to the required radius and pattern. Rain Bird
This is especially useful on larger installations where the same spray-body model may be used throughout the site while each location receives a quarter-, half-, full-circle or adjustable nozzle.
After selecting the body, you can compare the current Flow Supply Store Nozzles & Bubblers collection.
When a preassembled spray head makes sense
A preassembled spray head combines the body and a selected nozzle under one SKU.
The advantage is simpler product selection when the required combination is already known. Instead of ordering a body and nozzle separately, the installer receives a predetermined configuration.
Flow Supply Store's Irritrol SL products are a good example. The current Spray Bodies collection includes 4-inch SL assemblies with several nozzle-radius options, including the Irritrol SLP408, SLP410, SLP412, SLP415 and SLP417. The collection identifies these as 4-inch preassembled heads with different included nozzle configurations. Flow Supply Store
That makes the radius part of the SKU selection rather than a separate nozzle decision.
Check the inlet before treating a product as a replacement
Pop-up height can match perfectly while the plumbing connection does not.
The Hunter PROS-04, for example, uses a 1/2-inch inlet according to Hunter's Pro-Spray specification. Hunter Industries Rain Bird likewise specifies a 1/2-inch female threaded inlet for the 1800 Series.
This does not mean every spray body from every manufacturer should be treated as a direct interchangeable replacement.
The physical dimensions, stem design, nozzle interface and available options can still differ. For an existing installation, record the full model printed on the current sprinkler before choosing another product.
Nozzle compatibility matters
Even when two bodies have similar dimensions, the nozzle interface should be verified.
Hunter identifies Pro-Spray bodies as compatible with female-threaded nozzles within its supported system. Hunter Industries Rain Bird's 1800 Series is designed around Rain Bird spray and compatible rotary nozzle families. Rain Bird
This is why a statement such as “all spray nozzles fit all spray bodies” would be unsafe.
If you are replacing only the body and intend to reuse the existing nozzle, confirm that the new body supports that exact nozzle interface first.
For nozzle-selection principles, link this article to the previous Fixed vs Adjustable Spray Nozzles guide once that guide is published.
Pressure can influence the complete spray assembly
The body itself does not determine the entire irrigation pattern. The installed nozzle and operating pressure have a major influence on performance.
Manufacturers therefore offer pressure-regulated spray bodies for installations where controlling pressure at the sprinkler is important. Hunter, for example, distinguishes standard Pro-Spray bodies from PRS30 and PRS40 pressure-regulated versions. Hunter Industries
For a simple replacement, the important rule is not to assume a standard body and a pressure-regulated body are equivalent just because the pop-up height matches.
If the existing system intentionally uses pressure-regulated spray bodies, preserve that requirement unless the irrigation design is being reviewed.
Standard body versus check-valve body
For Flow Supply Store's current catalog, Hunter provides a very clear comparison:
| Model | Pop-up | Check valve | Nozzle |
|---|---|---|---|
| Hunter PROS-04 | 10 cm | Standard configuration | Select separately |
| Hunter PROS-04-CV | 10 cm | Yes | Select separately |
| Hunter PSU-04-10A-NFO | 10 cm | Check exact configuration | 10A installed |
| Hunter PSU-04-15A-NFO | 10 cm | Check exact configuration | 15A installed |
The safest purchasing approach is to use the complete SKU, rather than treating every 4-inch Hunter body as the same product.
Choosing between the main types
For a straightforward replacement where you already have a suitable nozzle, a body-only spray head such as the Hunter PROS-04 or Rain Bird 1804R can make sense.
If the site experiences drainage through low-elevation sprinklers after shutdown, consider whether the original design requires a check-valve version such as the PROS-04-CV.
If you already know both the desired body and nozzle radius, a preassembled head such as Hunter PS Ultra or Irritrol SL can reduce the number of separate components that need to be selected.
The correct decision should therefore be based on:
existing model + pop-up height + inlet + check-valve requirement + nozzle configuration + system pressure.
Before ordering a replacement spray body
For an existing irrigation system, record the manufacturer and full model from the current body, the pop-up height, inlet size, nozzle model, whether a check valve is installed, and whether the current product is body-only or preassembled.
Also check whether the site uses pressure-regulated bodies or has a significant elevation difference within the zone.
Matching those details is usually safer than selecting a replacement only because it is described as a “4-inch spray head.”
Products to compare
For body-only installations, compare the Hunter PROS-04, Hunter PROS-04-CV, Rain Bird 1804R and Rain Bird 1802R.
For preassembled products, compare the Hunter PS Ultra range and Irritrol SL Series according to their included nozzle radius.
Browse the complete Spray Bodies collection for the current Flow Supply Store selection.
Frequently asked questions
Does a spray body come with a nozzle?
Not always. Some models are body-only while others are sold with a factory-installed or preassembled nozzle. The exact product title and SKU should state the configuration.
Is a 4-inch spray body the same as a 4-inch spray radius?
No. A 4-inch body describes pop-up height. Spray radius is determined primarily by the nozzle and operating conditions.
What does CV mean on a Hunter spray body?
For applicable Hunter Pro-Spray configurations, CV identifies a check-valve version intended to help prevent low-head drainage. Hunter Industries
Should I choose the tallest spray body available?
Not automatically. Pop-up height should suit the installation and surrounding vegetation. A taller body is not inherently more efficient or more compatible.
Can I reuse my old nozzle on a new spray body?
Potentially, but only if the nozzle interface is compatible and the nozzle is still appropriate for the zone's radius, arc and precipitation requirements.
What is the advantage of a preassembled spray head?
It combines a known spray-body and nozzle configuration into one SKU, which can simplify purchasing when the required radius and body are already known.
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