diff --git a/src/fmu/dataio/_products/inplace_volumes.py b/src/fmu/dataio/_products/inplace_volumes.py
index 76a9d3aab..f3acf4350 100644
--- a/src/fmu/dataio/_products/inplace_volumes.py
+++ b/src/fmu/dataio/_products/inplace_volumes.py
@@ -5,6 +5,8 @@
 from pydantic import BaseModel, Field, RootModel
 from pydantic.json_schema import GenerateJsonSchema
 
+from fmu.dataio.export._enums import InplaceVolumes
+
 if TYPE_CHECKING:
     from typing import Any, Mapping
 
@@ -23,7 +25,7 @@ class InplaceVolumesResultRow(BaseModel):
     should increase the version number in a way that corresponds to the schema
     versioning specification (i.e. they are a patch, minor, or major change)."""
 
-    FLUID: Literal["oil", "gas", "water"]
+    FLUID: InplaceVolumes.Fluid
     ZONE: str
     REGION: Optional[str] = Field(default=None)
     FACIES: Optional[str] = Field(default=None)
diff --git a/src/fmu/dataio/export/rms/_enums.py b/src/fmu/dataio/export/_enums.py
similarity index 91%
rename from src/fmu/dataio/export/rms/_enums.py
rename to src/fmu/dataio/export/_enums.py
index 2bbdfe78f..8fdfd4bc5 100644
--- a/src/fmu/dataio/export/rms/_enums.py
+++ b/src/fmu/dataio/export/_enums.py
@@ -8,11 +8,11 @@ class InplaceVolumes:
     """Enumerations relevant to inplace volumes tables."""
 
     class Fluid(str, Enum):
-        """Fluid types"""
+        """Fluid types used as values in the FLUID column."""
 
-        OIL = "OIL"
-        GAS = "GAS"
-        WATER = "WATER"
+        oil = "oil"
+        gas = "gas"
+        water = "water"
 
     class TableIndexColumns(str, Enum):
         """The index columns for an inplace volumes table."""
diff --git a/src/fmu/dataio/export/rms/inplace_volumes.py b/src/fmu/dataio/export/rms/inplace_volumes.py
index 2c7b46e26..cae505f35 100644
--- a/src/fmu/dataio/export/rms/inplace_volumes.py
+++ b/src/fmu/dataio/export/rms/inplace_volumes.py
@@ -11,9 +11,9 @@
 import fmu.dataio as dio
 from fmu.dataio._logging import null_logger
 from fmu.dataio._model.enums import Classification
+from fmu.dataio.export import _enums
 from fmu.dataio.export._decorators import experimental
 from fmu.dataio.export._export_result import ExportResult, ExportResultItem
-from fmu.dataio.export.rms import _enums
 from fmu.dataio.export.rms._conditional_rms_imports import import_rms_package
 from fmu.dataio.export.rms._utils import (
     check_rmsapi_version,
@@ -154,19 +154,24 @@ def _transform_and_add_fluid_column_to_table(
         ]
 
         tables = []
-        for fluid in [
-            _enums.InplaceVolumes.Fluid.GAS.value,
-            _enums.InplaceVolumes.Fluid.OIL.value,
-        ]:
-            fluid_columns = [col for col in table.columns if col.endswith(f"_{fluid}")]
+        for fluid in (
+            _enums.InplaceVolumes.Fluid.gas.value,
+            _enums.InplaceVolumes.Fluid.oil.value,
+        ):
+            fluid_suffix = fluid.upper()
+            fluid_columns = [
+                col for col in table.columns if col.endswith(f"_{fluid_suffix}")
+            ]
             if fluid_columns:
                 fluid_table = table[table_index + fluid_columns].copy()
 
                 # drop fluid suffix from columns to get standard names
-                fluid_table.columns = fluid_table.columns.str.replace(f"_{fluid}", "")
+                fluid_table.columns = fluid_table.columns.str.replace(
+                    f"_{fluid_suffix}", ""
+                )
 
                 # add the fluid as column entry instead
-                fluid_table[_enums.InplaceVolumes.FLUID_COLUMN] = fluid.lower()
+                fluid_table[_enums.InplaceVolumes.FLUID_COLUMN] = fluid
 
                 tables.append(fluid_table)
 
diff --git a/tests/test_export_rms/test_export_rms_volumetrics.py b/tests/test_export_rms/test_export_rms_volumetrics.py
index f34c9bc5e..6a7cd4223 100644
--- a/tests/test_export_rms/test_export_rms_volumetrics.py
+++ b/tests/test_export_rms/test_export_rms_volumetrics.py
@@ -15,6 +15,7 @@
     InplaceVolumesResultRow,
     dump,
 )
+from fmu.dataio.export import _enums
 from tests.utils import inside_rms
 
 logger = null_logger(__name__)
@@ -94,8 +95,6 @@ def test_rms_volumetrics_export_class(exportvolumetrics):
 def test_rms_volumetrics_export_class_table_index(voltable_standard, exportvolumetrics):
     """See mocks in local conftest.py"""
 
-    from fmu.dataio.export.rms import _enums
-
     out = exportvolumetrics._export_volume_table()
     metadata = dataio.read_metadata(out.items[0].absolute_path)
 
@@ -120,7 +119,6 @@ def test_convert_table_from_legacy_to_standard_format(
     """Test that a voltable with legacy format is converted to
     the expected standard format"""
 
-    from fmu.dataio.export.rms import _enums
     from fmu.dataio.export.rms.inplace_volumes import _ExportVolumetricsRMS
 
     monkeypatch.chdir(rmssetup_with_fmuconfig)
@@ -299,7 +297,7 @@ def test_rms_volumetrics_export_function(
 ):
     """Test the public function."""
 
-    from fmu.dataio.export.rms import _enums, export_inplace_volumes
+    from fmu.dataio.export.rms import export_inplace_volumes
     from fmu.dataio.export.rms.inplace_volumes import _ExportVolumetricsRMS
 
     monkeypatch.chdir(rmssetup_with_fmuconfig)
@@ -360,8 +358,6 @@ def test_inplace_volumes_payload_validates_against_schema(
 def test_inplace_volumes_export_and_result_columns_are_the_same(
     mocked_rmsapi_modules,
 ) -> None:
-    from fmu.dataio.export.rms import _enums
-
     assert _enums.InplaceVolumes.table_columns() == list(
         InplaceVolumesResultRow.model_fields.keys()
     )