diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 3b1666b16..0f5b13447 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -42,6 +42,8 @@ Change Log
 - [ADDED] possibility to change the "soft_overflow_threshold" in the parameters (like
   the "hard_overflow_threshold" but for delayed protections). 
   See `param.SOFT_OVERFLOW_THRESHOLD`
+- [ADDED] the `gym_env.observation_space.get_index(attr_nm)` for `BoxGymObsSpace` that allows to retrieve which index
+  of the observation represents which attribute.
 
 [1.9.2] - 2023-07-26
 ---------------------
diff --git a/grid2op/gym_compat/box_gym_obsspace.py b/grid2op/gym_compat/box_gym_obsspace.py
index 5a5a778a7..edb979383 100644
--- a/grid2op/gym_compat/box_gym_obsspace.py
+++ b/grid2op/gym_compat/box_gym_obsspace.py
@@ -6,6 +6,7 @@
 # SPDX-License-Identifier: MPL-2.0
 # This file is part of Grid2Op, Grid2Op a testbed platform to model sequential decision making in power systems.
 
+from typing import Tuple
 import copy
 import warnings
 import numpy as np
@@ -813,6 +814,54 @@ def to_gym(self, grid2op_observation):
     def close(self):
         pass
 
+    def get_indexes(self, key: str) -> Tuple[int, int]:
+        """Allows to retrieve the indexes of the gym action that
+        are concerned by the attribute name `key` given in input.
+
+        .. versionadded:: 1.9.3
+        
+        .. warning::
+            Copy paste from box_gym_act_space, need refacto !
+            
+        Parameters
+        ----------
+        key : str
+            the attribute name (*eg* "set_storage" or "redispatch")
+
+        Returns
+        -------
+        Tuple[int, int]
+            _description_
+
+        Examples
+        --------
+        
+        You can use it like:
+        
+        .. code-block:: python
+        
+            gym_env = ... # an environment with a BoxActSpace
+            
+            act = np.zeros(gym_env.action_space.shape)
+            key = "redispatch"  # "redispatch", "curtail", "set_storage"
+            start_, end_ = gym_env.action_space.get_indexes(key)
+            act[start_:end_] = np.random.uniform(high=1, low=-1, size=env.gen_redispatchable.sum())
+            # act only modifies the redispatch with the input given (here a uniform redispatching between -1 and 1)
+            
+        """
+        error_msg =(f"Impossible to use the grid2op action property \"{key}\""
+                    f"with this action space.")
+        if key not in self._attr_to_keep:
+            raise Grid2OpException(error_msg)
+        prev = 0
+        for attr_nm, where_to_put in zip(
+            self._attr_to_keep, self._dims
+        ):
+            if attr_nm == key:
+                return prev, where_to_put
+            prev = where_to_put
+        raise Grid2OpException(error_msg)
+    
     def normalize_attr(self, attr_nm: str):
         """
         This function normalizes the part of the space
diff --git a/grid2op/tests/test_Parameters.py b/grid2op/tests/test_Parameters.py
index 7c609eb38..3be4a4892 100644
--- a/grid2op/tests/test_Parameters.py
+++ b/grid2op/tests/test_Parameters.py
@@ -87,7 +87,7 @@ def _aux_check_attr_int(self, param, attr_name):
         setattr(param, attr_name, 1)
         param.check_valid()
 
-    def _aux_check_attr_float(self, param, attr_name):
+    def _aux_check_attr_float(self, param, attr_name, test_bool=True):
         tmp = getattr(param, attr_name)
         # don't work with string
         setattr(param, attr_name, "toto")
@@ -102,8 +102,9 @@ def _aux_check_attr_float(self, param, attr_name):
         with self.assertRaises(RuntimeError):
             param.check_valid()
         # work with bool
-        setattr(param, attr_name, True)
-        param.check_valid()
+        if test_bool:
+            setattr(param, attr_name, True)
+            param.check_valid()
         # work with int value
         setattr(param, attr_name, int(tmp))
         param.check_valid()
@@ -153,9 +154,11 @@ def test_check_valid(self):
             except Exception as exc_:
                 raise RuntimeError(f'Exception "{exc_}" for attribute "{attr_nm}"')
         # float types
-        for attr_nm in ["HARD_OVERFLOW_THRESHOLD", "INIT_STORAGE_CAPACITY"]:
+        for attr_nm in ["HARD_OVERFLOW_THRESHOLD",
+                        "SOFT_OVERFLOW_THRESHOLD",
+                        "INIT_STORAGE_CAPACITY"]:
             try:
-                self._aux_check_attr_float(p, attr_nm)
+                self._aux_check_attr_float(p, attr_nm, test_bool=(attr_nm!="HARD_OVERFLOW_THRESHOLD"))
             except Exception as exc_:
                 raise RuntimeError(f'Exception "{exc_}" for attribute "{attr_nm}"')
 
diff --git a/grid2op/tests/test_change_param_from_obs.py b/grid2op/tests/test_change_param_from_obs.py
index e13a0537e..8a0b124f6 100644
--- a/grid2op/tests/test_change_param_from_obs.py
+++ b/grid2op/tests/test_change_param_from_obs.py
@@ -26,7 +26,7 @@ def tearDown(self) -> None:
     def test_change_param_simulate(self):
         l_id = 3
         params = self.env.parameters
-        params.HARD_OVERFLOW_THRESHOLD = 1.
+        params.HARD_OVERFLOW_THRESHOLD = 1.001
         th_lim = self.env.get_thermal_limit()
         th_lim[l_id] = 170
         self.env.set_thermal_limit(th_lim)