diff --git a/src/cal_tools/constants.py b/src/cal_tools/constants.py
index ac56c1e7a6c32e0d2b209d7383a5963d6d3e6639..edd00892cbcd8d44f0f03c05bf9c2f9b9d4d7be9 100644
--- a/src/cal_tools/constants.py
+++ b/src/cal_tools/constants.py
@@ -29,32 +29,6 @@ class CCVAlreadyInjectedError(InjectionError):
     ...
 
 
-
-class CalCatInjector:
-    """Helper methods for requests to CalCat"""
-    def __init__(self, client: CalCatAPIClient):
-        self.client = client
-
-    # Posting APIs
-    def set_expected_condition(self, conditions: dict):
-        return self.client.post("conditions/set_expected_condition", conditions)
-
-    def create_calibration_constant(self, calibration_constant: dict):
-        return self.client.post("calibration_constants", calibration_constant)
-
-    def get_or_create_report(self, report: dict):
-        # Based on create or get API
-        return self.client.post("reports/set", report)
-
-    def create_calibration_constant_version(self, ccv: dict):
-        try:
-            return self.client.post("calibration_constant_versions", ccv)
-        except CalCatAPIError as e:
-            if e.status_code == 422:
-                raise CCVAlreadyInjectedError
-            raise
-
-
 @dataclass
 class ParameterConditionAttribute:
     value: str
@@ -250,7 +224,7 @@ def get_condition_dict(
 
 
 def get_or_create_calibration_constant(
-    injector: CalCatInjector,
+    client: CalCatAPIClient,
     calibration: str,
     detector_type: str,
     condition_id: int,
@@ -259,8 +233,8 @@ def get_or_create_calibration_constant(
     cond_id = condition_id
 
     # Prepare some parameters to set Calibration Constant.
-    cal_id = injector.client.calibration_by_name(calibration)['id']
-    det_type_id = injector.client.detector_type_by_name(detector_type)['id']
+    cal_id = client.calibration_by_name(calibration)['id']
+    det_type_id = client.detector_type_by_name(detector_type)['id']
     cc_name = create_unique_cc_name(detector_type, calibration, condition_name)
 
     calibration_constant = dict(
@@ -273,19 +247,19 @@ def get_or_create_calibration_constant(
         description = "",
     )
     try:
-        cc_id = injector.client.get(
-            f"calibrations/{cal_id}/get_calibration_constant",  # noqa
+        cc_id = client.get(
+            f"calibrations/{cal_id}/get_calibration_constant",
             calibration_constant
         )
     except CalCatAPIError as e:
         if e.status_code != 404:
             raise
-        cc_id = injector.create_calibration_constant(calibration_constant)['id']
+        cc_id = client.post("calibration_constants", calibration_constant)['id']
     return cc_id
 
 
 def create_condition(
-    injector: CalCatInjector,
+    client: CalCatAPIClient,
     detector_type: str,
     pdu_name: str,
     pdu_uuid: float,
@@ -297,7 +271,7 @@ def create_condition(
 
     # Add the missing parameter_id value in `ParameterConditionAttribute`s.
     for param, cond in cond_params.items():
-        cond.parameter_id = injector.client.parameter_by_name(param)['id']
+        cond.parameter_id = client.parameter_by_name(param)['id']
         cond_params[param] = asdict(cond)
 
     # Create condition table in database, if not available.
@@ -308,7 +282,9 @@ def create_condition(
         event_at = str(datetime.today()),  # TODO: Why is this needed? it is not written in swagger.
         description = '',
     )
-    resp = injector.set_expected_condition({"condition":cond})
+    resp = client.post(
+        "conditions/set_expected_condition", {"condition": cond}
+    )
     return resp['id'], cond_name
 
 
@@ -356,12 +332,12 @@ def inject_ccv(const_src, ccv_root, report_to=None, client=None):
         const_src (str or Path): Path to CCV data file.
         ccv_root (str): CCV HDF group name.
         report_to (str): Metadata location.
+        client (CalCatAPIClient, optional): Client for CalCat API.
     Raises:
         RuntimeError: If CalCat POST request fails.
     """
     if client is None:
         client = get_client()
-    injector = CalCatInjector(client)
 
     pdu_name, calibration, _ = ccv_root.lstrip('/').split('/')
 
@@ -377,17 +353,17 @@ def inject_ccv(const_src, ccv_root, report_to=None, client=None):
 
     try:
         condition_id, condition_name = create_condition(
-            injector, detector_type, pdu_name, pdu_uuid, cond_params)
+            client, detector_type, pdu_name, pdu_uuid, cond_params)
 
         # Create Calibration Constant in database, if not available.
         cc_id = get_or_create_calibration_constant(
-            injector, calibration, detector_type, condition_id, condition_name)
+            client, calibration, detector_type, condition_id, condition_name)
 
         # Create report in database, if not available
         report_id = None
         if report_to:
             report_path = Path(report_to).absolute().with_suffix('.pdf')
-            resp = injector.get_or_create_report(dict(
+            resp = client.post("reports/set", dict(
                 name=report_path.stem,
                 file_path=str(report_path),
                 flg_available='true',
@@ -418,7 +394,12 @@ def inject_ccv(const_src, ccv_root, report_to=None, client=None):
             flg_good_quality = 'true',
             description = '',
         )
-        injector.create_calibration_constant_version(ccv)
+        try:
+            client.post("calibration_constant_versions", ccv)
+        except CalCatAPIError as e:
+            if e.status_code == 422:
+                raise CCVAlreadyInjectedError
+            raise
     except Exception:
         const_dest.unlink()  # Delete already copied CCV file.
         raise