diff --git a/hyper/contrib.py b/hyper/contrib.py
index dccec518..958addb9 100644
--- a/hyper/contrib.py
+++ b/hyper/contrib.py
@@ -157,3 +157,7 @@ def getheaders(self, name):
         orig.msg = FakeOriginalResponse(resp.headers.iter_raw())
 
         return response
+
+    def close(self):
+        for connection in self.connections.values():
+            connection._conn.close()
diff --git a/test/test_hyper.py b/test/test_hyper.py
index 6a18d592..b5413118 100644
--- a/test/test_hyper.py
+++ b/test/test_hyper.py
@@ -26,6 +26,7 @@
 import socket
 import zlib
 from io import BytesIO
+import requests
 
 TEST_DIR = os.path.abspath(os.path.dirname(__file__))
 TEST_CERTS_DIR = os.path.join(TEST_DIR, 'certs')
@@ -1128,6 +1129,22 @@ def test_adapter_accept_client_certificate(self):
             cert=CLIENT_PEM_FILE)
         assert conn1 is conn2
 
+    def test_adapter_close(self):
+        """
+        Tests HTTP20Adapter properly closes connections
+        """
+        s = requests.Session()
+        s.mount('https://', HTTP20Adapter())
+        s.close()
+
+    def test_adapter_close_context_manager(self):
+        """
+        Tests HTTP20Adapter properly closes connections via context manager
+        """
+        with requests.Session() as s:
+            a = HTTP20Adapter()
+            s.mount('https://', a)
+
 
 class TestUtilities(object):
     def test_combining_repeated_headers(self):