diff --git a/quark/api/extensions/diagnostics.py b/quark/api/extensions/diagnostics.py
index f685c4c..d8f8f40 100644
--- a/quark/api/extensions/diagnostics.py
+++ b/quark/api/extensions/diagnostics.py
@@ -16,8 +16,9 @@
 import functools
 
 from neutron.api import extensions
-from neutron import manager
+from neutron_lib.api import extensions as nl_extensions
 from neutron_lib import exceptions as n_exc
+from neutron_lib.plugins import directory
 from oslo_log import log as logging
 LOG = logging.getLogger(__name__)
 
@@ -39,7 +40,7 @@ class Diagnostician(object):
                 req.context, id, input['diag'])
 
 
-class Diagnostics(extensions.ExtensionDescriptor):
+class Diagnostics(nl_extensions.ExtensionDescriptor):
     def get_name(self):
         return "Diagnostics"
 
@@ -56,7 +57,7 @@ class Diagnostics(extensions.ExtensionDescriptor):
         return "never"
 
     def get_actions(self):
-        diagnose = Diagnostician(manager.NeutronManager.get_plugin()).diagnose
+        diagnose = Diagnostician(directory.get_plugin()).diagnose
         resources = ['port', 'subnet', 'network']
         return (extensions.ActionExtension('%ss' % res, 'diag',
                 functools.partial(diagnose, res)) for res in resources)
diff --git a/quark/api/extensions/floatingip.py b/quark/api/extensions/floatingip.py
index 40a1eea..b49b9ee 100644
--- a/quark/api/extensions/floatingip.py
+++ b/quark/api/extensions/floatingip.py
@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from neutron.api import extensions
+from neutron_lib.api import extensions
 
 RESOURCE_NAME = "floatingip"
 RESOURCE_COLLECTION = RESOURCE_NAME + "s"
diff --git a/quark/api/extensions/ip_addresses.py b/quark/api/extensions/ip_addresses.py
index 0a773cc..c02d0e9 100644
--- a/quark/api/extensions/ip_addresses.py
+++ b/quark/api/extensions/ip_addresses.py
@@ -14,8 +14,9 @@
 # limitations under the License.
 
 from neutron.api import extensions
-from neutron import manager
 from neutron import wsgi
+from neutron_lib.api import extensions as nl_extensions
+from neutron_lib.plugins import directory
 from oslo_log import log as logging
 import quark.utils as utils
 import webob
@@ -119,7 +120,7 @@ class IpAddressPortController(wsgi.Controller):
         raise webob.exc.HTTPNotImplemented()
 
 
-class Ip_addresses(extensions.ExtensionDescriptor):
+class Ip_addresses(nl_extensions.ExtensionDescriptor):
     """IP Addresses support."""
     @classmethod
     def get_name(cls):
@@ -152,9 +153,9 @@ class Ip_addresses(extensions.ExtensionDescriptor):
     def get_resources(cls):
         """Returns Ext Resources."""
         ip_controller = IpAddressesController(
-            manager.NeutronManager.get_plugin())
+            directory.get_plugin())
         ip_port_controller = IpAddressPortController(
-            manager.NeutronManager.get_plugin())
+            directory.get_plugin())
         resources = []
         resources.append(extensions.ResourceExtension(
                          Ip_addresses.get_alias(),
diff --git a/quark/api/extensions/ip_availability.py b/quark/api/extensions/ip_availability.py
index c74be33..fbfa136 100644
--- a/quark/api/extensions/ip_availability.py
+++ b/quark/api/extensions/ip_availability.py
@@ -14,9 +14,10 @@
 # limitations under the License.
 
 from neutron.api import extensions
-from neutron import manager
 from neutron import wsgi
+from neutron_lib.api import extensions as nl_extensions
 from neutron_lib import exceptions as n_exc
+from neutron_lib.plugins import directory
 from oslo_log import log as logging
 
 RESOURCE_NAME = "ip_availability"
@@ -45,7 +46,7 @@ class IPAvailabilityController(wsgi.Controller):
         return self._plugin.get_ip_availability(**request.GET)
 
 
-class Ip_availability(extensions.ExtensionDescriptor):
+class Ip_availability(nl_extensions.ExtensionDescriptor):
     """IP Availability support."""
     @classmethod
     def get_name(cls):
@@ -77,7 +78,7 @@ class Ip_availability(extensions.ExtensionDescriptor):
     @classmethod
     def get_resources(cls):
         """Returns Ext Resources."""
-        plugin = manager.NeutronManager.get_plugin()
+        plugin = directory.get_plugin()
         controller = IPAvailabilityController(plugin)
         return [extensions.ResourceExtension(Ip_availability.get_alias(),
                                              controller)]
diff --git a/quark/api/extensions/ip_policies.py b/quark/api/extensions/ip_policies.py
index 32e058c..158d130 100644
--- a/quark/api/extensions/ip_policies.py
+++ b/quark/api/extensions/ip_policies.py
@@ -14,8 +14,9 @@
 # limitations under the License.
 
 from neutron.api import extensions
-from neutron import manager
 from neutron import wsgi
+from neutron_lib.api import extensions as nl_extensions
+from neutron_lib.plugins import directory
 from oslo_log import log as logging
 import quark.utils as utils
 
@@ -67,7 +68,7 @@ class IPPoliciesController(wsgi.Controller):
         return self._plugin.delete_ip_policy(context, id)
 
 
-class Ip_policies(extensions.ExtensionDescriptor):
+class Ip_policies(nl_extensions.ExtensionDescriptor):
     """IP Policies support."""
     @classmethod
     def get_name(cls):
@@ -100,7 +101,7 @@ class Ip_policies(extensions.ExtensionDescriptor):
     @classmethod
     def get_resources(cls):
         """Returns Ext Resources."""
-        plugin = manager.NeutronManager.get_plugin()
+        plugin = directory.get_plugin()
         controller = IPPoliciesController(plugin)
         return [extensions.ResourceExtension(Ip_policies.get_alias(),
                                              controller)]
diff --git a/quark/api/extensions/jobs.py b/quark/api/extensions/jobs.py
index c51f22a..940070a 100644
--- a/quark/api/extensions/jobs.py
+++ b/quark/api/extensions/jobs.py
@@ -14,8 +14,9 @@
 # limitations under the License.
 
 from neutron.api import extensions
-from neutron import manager
 from neutron import wsgi
+from neutron_lib.api import extensions as nl_extensions
+from neutron_lib.plugins import directory
 from oslo_log import log as logging
 import quark.utils as utils
 
@@ -69,7 +70,7 @@ class JobsController(wsgi.Controller):
         return self._plugin.delete_job(context, id)
 
 
-class Jobs(extensions.ExtensionDescriptor):
+class Jobs(nl_extensions.ExtensionDescriptor):
     """Jobs support."""
     @classmethod
     def get_name(cls):
@@ -102,7 +103,7 @@ class Jobs(extensions.ExtensionDescriptor):
     def get_resources(cls):
         """Returns Ext Resources."""
         job_controller = JobsController(
-            manager.NeutronManager.get_plugin())
+            directory.get_plugin())
         resources = []
         resources.append(extensions.ResourceExtension(
                          Jobs.get_alias(),
diff --git a/quark/api/extensions/mac_address_ranges.py b/quark/api/extensions/mac_address_ranges.py
index 7d859bb..8bfff35 100644
--- a/quark/api/extensions/mac_address_ranges.py
+++ b/quark/api/extensions/mac_address_ranges.py
@@ -14,8 +14,9 @@
 # limitations under the License.
 
 from neutron.api import extensions
-from neutron import manager
 from neutron import wsgi
+from neutron_lib.api import extensions as nl_extensions
+from neutron_lib.plugins import directory
 from oslo_log import log as logging
 import quark.utils as utils
 
@@ -68,7 +69,7 @@ class MacAddressRangesController(wsgi.Controller):
         return self._plugin.delete_mac_address_range(context, id)
 
 
-class Mac_address_ranges(extensions.ExtensionDescriptor):
+class Mac_address_ranges(nl_extensions.ExtensionDescriptor):
     """Mac Address Range support."""
     @classmethod
     def get_name(cls):
@@ -101,7 +102,7 @@ class Mac_address_ranges(extensions.ExtensionDescriptor):
     @classmethod
     def get_resources(cls):
         """Returns Ext Resources."""
-        plugin = manager.NeutronManager.get_plugin()
+        plugin = directory.get_plugin()
         controller = MacAddressRangesController(plugin)
         return [extensions.ResourceExtension(Mac_address_ranges.get_alias(),
                                              controller)]
diff --git a/quark/api/extensions/networks_quark.py b/quark/api/extensions/networks_quark.py
index 6265e02..4f4b8ca 100644
--- a/quark/api/extensions/networks_quark.py
+++ b/quark/api/extensions/networks_quark.py
@@ -14,7 +14,7 @@
 # limitations under the License.
 
 
-from neutron.api import extensions
+from neutron_lib.api import extensions
 
 RESOURCE_NAME = "network"
 RESOURCE_COLLECTION = RESOURCE_NAME + "s"
diff --git a/quark/api/extensions/ports_quark.py b/quark/api/extensions/ports_quark.py
index d9965dd..807c99a 100644
--- a/quark/api/extensions/ports_quark.py
+++ b/quark/api/extensions/ports_quark.py
@@ -13,9 +13,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from neutron.api import extensions
 from neutron.extensions import securitygroup
 from neutron_lib.api import converters as conv
+from neutron_lib.api import extensions
 from neutron_lib import constants as const
 
 RESOURCE_NAME = "port"
diff --git a/quark/api/extensions/routes.py b/quark/api/extensions/routes.py
index 7132205..601873a 100644
--- a/quark/api/extensions/routes.py
+++ b/quark/api/extensions/routes.py
@@ -14,8 +14,9 @@
 # limitations under the License.
 
 from neutron.api import extensions
-from neutron import manager
 from neutron import wsgi
+from neutron_lib.api import extensions as nl_extensions
+from neutron_lib.plugins import directory
 from oslo_log import log as logging
 import quark.utils as utils
 
@@ -67,7 +68,7 @@ class RoutesController(wsgi.Controller):
         self._plugin.delete_route(context, id)
 
 
-class Routes(extensions.ExtensionDescriptor):
+class Routes(nl_extensions.ExtensionDescriptor):
     """Routes support."""
     @classmethod
     def get_name(cls):
@@ -98,7 +99,7 @@ class Routes(extensions.ExtensionDescriptor):
     @classmethod
     def get_resources(cls):
         """Returns Ext Resources."""
-        controller = RoutesController(manager.NeutronManager.get_plugin())
+        controller = RoutesController(directory.get_plugin())
         return [extensions.ResourceExtension(
             Routes.get_alias(),
             controller)]
diff --git a/quark/api/extensions/scalingip.py b/quark/api/extensions/scalingip.py
index 1ff6b8a..e358f76 100644
--- a/quark/api/extensions/scalingip.py
+++ b/quark/api/extensions/scalingip.py
@@ -13,9 +13,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from neutron.api import extensions
+from neutron._i18n import _
 from neutron.api.v2 import attributes as attr
 from neutron.api.v2 import resource_helper
+from neutron_lib.api import extensions
 from neutron_lib.api import validators
 from oslo_log import log as logging
 
@@ -79,7 +80,7 @@ RESOURCE_ATTRIBUTE_MAP = {
         "tenant_id": {
             'allow_post': True, 'allow_put': False,
             'required_by_policy': True,
-            'validate': {'type:string': attr.TENANT_ID_MAX_LEN},
+            'validate': {'type:string': None},
             'is_visible': True
         },
         "scaling_network_id": {
@@ -127,7 +128,7 @@ class Scalingip(extensions.ExtensionDescriptor):
         """Returns Ext Resources."""
         plural_mappings = resource_helper.build_plural_mappings(
             {}, RESOURCE_ATTRIBUTE_MAP)
-        attr.PLURALS.update(plural_mappings)
+        # attr.PLURALS.update(plural_mappings)
         return resource_helper.build_resource_info(plural_mappings,
                                                    RESOURCE_ATTRIBUTE_MAP,
                                                    None,
diff --git a/quark/api/extensions/security_group_rules.py b/quark/api/extensions/security_group_rules.py
index 92b43b2..80cf966 100644
--- a/quark/api/extensions/security_group_rules.py
+++ b/quark/api/extensions/security_group_rules.py
@@ -13,7 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from neutron.api import extensions
+from neutron_lib.api import extensions
 
 EXTENDED_ATTRIBUTES_2_0 = {
     "security_group_rules": {
diff --git a/quark/api/extensions/security_groups.py b/quark/api/extensions/security_groups.py
index b2f01a3..04635d8 100644
--- a/quark/api/extensions/security_groups.py
+++ b/quark/api/extensions/security_groups.py
@@ -13,7 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from neutron.api import extensions
+from neutron_lib.api import extensions
 
 EXTENDED_ATTRIBUTES_2_0 = {
     "security_groups": {
diff --git a/quark/api/extensions/segment_allocation_ranges.py b/quark/api/extensions/segment_allocation_ranges.py
index 4e15722..b670b68 100644
--- a/quark/api/extensions/segment_allocation_ranges.py
+++ b/quark/api/extensions/segment_allocation_ranges.py
@@ -14,8 +14,9 @@
 # limitations under the License.
 
 from neutron.api import extensions
-from neutron import manager
 from neutron import wsgi
+from neutron_lib.api import extensions as nl_extensions
+from neutron_lib.plugins import directory
 from oslo_log import log as logging
 import quark.utils as utils
 
@@ -65,7 +66,7 @@ class SegmentAllocationRangesController(wsgi.Controller):
         return self._plugin.delete_segment_allocation_range(context, id)
 
 
-class Segment_allocation_ranges(extensions.ExtensionDescriptor):
+class Segment_allocation_ranges(nl_extensions.ExtensionDescriptor):
     """Segment Allocation Range support."""
     @classmethod
     def get_name(cls):
@@ -98,7 +99,7 @@ class Segment_allocation_ranges(extensions.ExtensionDescriptor):
     @classmethod
     def get_resources(cls):
         """Returns Ext Resources."""
-        plugin = manager.NeutronManager.get_plugin()
+        plugin = directory.get_plugin()
         controller = SegmentAllocationRangesController(plugin)
         return [extensions.ResourceExtension(
             Segment_allocation_ranges.get_alias(),
diff --git a/quark/api/extensions/subnets_quark.py b/quark/api/extensions/subnets_quark.py
index c78e322..410fb20 100644
--- a/quark/api/extensions/subnets_quark.py
+++ b/quark/api/extensions/subnets_quark.py
@@ -13,7 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from neutron.api import extensions
+from neutron_lib.api import extensions
 
 EXTENDED_ATTRIBUTES_2_0 = {
     "subnets": {