diff --git a/ptvp35/__init__.py b/ptvp35/__init__.py
index d8092f0..997f79c 100644
--- a/ptvp35/__init__.py
+++ b/ptvp35/__init__.py
@@ -1,6 +1,7 @@
 # Licensed under MIT License. Copyright: 2022-2023 PARRRATE TNV.
 
 __all__ = (
+    'KVDELETE',
     'KVFactory',
     'KVJson',
     'DbConnection',
@@ -66,6 +67,9 @@ class KVProtocol(abc.ABC):
         raise NotImplementedError
 
 
+KVDELETE = object()
+
+
 class KVFactory(KVProtocol):
     """this class is for working with already normalised data values, not for data transformation (e.g. reducing keys to a common form).
 that functionality may be added in the future, though, probably, only for custom DbConnection implementations.
@@ -73,8 +77,6 @@ note: unstable signature."""
 
     __slots__ = ()
 
-    DELETE = object()
-
     @abc.abstractmethod
     def line(self, key: Any, value: Any, /) -> str:
         """line must contain exactly one '\\n' at exactly the end if the line is not empty.
@@ -95,7 +97,7 @@ note: unstable signature."""
         self._dbset(db, key, value, reduce)
 
     def _dbset(self, db: dict, key: Any, value: Any, reduce: bool, /):
-        if reduce and value is self.DELETE:
+        if reduce and value is KVDELETE:
             db.pop(key, None)
         else:
             db[key] = value
@@ -108,7 +110,7 @@ note: unstable signature."""
         return self.filter_value(value, default)
 
     def filter_value(self, value: Any, default: Any, /):
-        if value is self.DELETE:
+        if value is KVDELETE:
             return default
         else:
             return value
@@ -168,7 +170,7 @@ class KVJson(KVFactory):
     __slots__ = ()
 
     def line(self, key: Any, value: Any, /) -> str:
-        if value is self.DELETE:
+        if value is KVDELETE:
             obj = {'key': key}
         else:
             obj = {'key': key, 'value': value}
@@ -188,7 +190,7 @@ class KVJson(KVFactory):
 
     def fromline(self, line: str, /) -> tuple[Any, Any]:
         d = json.loads(line)
-        return self._load_key(d['key']), d.get('value', self.DELETE)
+        return self._load_key(d['key']), d.get('value', KVDELETE)
 
 
 class TransactionRequest(LineRequest):