diff --git a/kr8s/_io.py b/kr8s/_io.py
index adaaca12..f3f50f96 100644
--- a/kr8s/_io.py
+++ b/kr8s/_io.py
@@ -14,15 +14,31 @@
 
 import inspect
 import subprocess
+import sys
 import tempfile
 from contextlib import asynccontextmanager
 from functools import partial, wraps
 from threading import Thread
-from typing import Any, AsyncGenerator, Awaitable, Callable, Generator, Tuple, TypeVar
+from typing import (
+    Any,
+    AsyncGenerator,
+    Awaitable,
+    Callable,
+    Generator,
+    Tuple,
+    TypeVar,
+)
+
+if sys.version_info >= (3, 10):
+    from typing import ParamSpec
+else:
+    from typing_extensions import ParamSpec
 
 import anyio
 
 T = TypeVar("T")
+C = TypeVar("C")
+P = ParamSpec("P")
 
 
 class Portal:
@@ -44,13 +60,13 @@ async def _run(self):
             self._portal = portal
             await portal.sleep_until_stopped()
 
-    def call(self, func: Callable[..., T], *args, **kwargs) -> T:
+    def call(self, func: Callable[P, T], *args, **kwargs) -> T:
         while not self._portal:
             pass
         return self._portal.call(func, *args, **kwargs)
 
 
-def run_sync(coro: Callable[..., Awaitable[T]]) -> Callable[..., T]:
+def run_sync(coro: Callable[P, Awaitable[T]]) -> Callable[P, T]:
     """Wraps coroutine in a function that blocks until it has executed.
 
     Parameters
@@ -65,18 +81,17 @@ def run_sync(coro: Callable[..., Awaitable[T]]) -> Callable[..., T]:
     """
 
     @wraps(coro)
-    def wrapped(*args, **kwargs):
+    def wrapper(*args: P.args, **kwargs: P.kwargs) -> T:
         wrapped = partial(coro, *args, **kwargs)
         wrapped.__doc__ = coro.__doc__
         if inspect.isasyncgenfunction(coro):
             return iter_over_async(wrapped)
-        portal = Portal()
         if inspect.iscoroutinefunction(coro):
+            portal = Portal()
             return portal.call(wrapped)
         raise TypeError(f"Expected coroutine function, got {coro.__class__.__name__}")
 
-    wrapped.__doc__ = coro.__doc__
-    return wrapped
+    return wrapper
 
 
 def iter_over_async(agen: AsyncGenerator) -> Generator:
@@ -97,7 +112,7 @@ async def get_next() -> Tuple[bool, Any]:
         yield obj
 
 
-def sync(source: object) -> object:
+def sync(source: C) -> C:
     """Convert all public async methods/properties of an object to universal methods.
 
     See :func:`run_sync` for more info