diff --git a/rd-net/RdFramework.Reflection/RdOuterLifetime.cs b/rd-net/RdFramework.Reflection/RdOuterLifetime.cs
new file mode 100644
index 000000000..1fc45e5fe
--- /dev/null
+++ b/rd-net/RdFramework.Reflection/RdOuterLifetime.cs
@@ -0,0 +1,72 @@
+using System;
+using JetBrains.Annotations;
+using JetBrains.Lifetimes;
+using JetBrains.Rd.Base;
+using JetBrains.Rd.Impl;
+using JetBrains.Serialization;
+
+namespace JetBrains.Rd.Reflection
+{
+  /// <summary>
+  /// Abstraction to send <see cref="OuterLifetime"/> over the protocol
+  /// </summary>
+  public sealed class RdOuterLifetime: RdReactiveBase
+  {
+    [NonSerialized] private LifetimeDefinition myLifetimeDefinition;
+    [NonSerialized] private bool myIsClientSide = false;
+
+    public static implicit operator OuterLifetime (RdOuterLifetime rdOuterLifetime)
+    {
+      return rdOuterLifetime.myLifetimeDefinition;
+    }
+
+    [UsedImplicitly]
+    public RdOuterLifetime()
+    {
+    }
+
+    protected override void Init(Lifetime lifetime)
+    {
+      base.Init(lifetime);
+      myLifetimeDefinition = Lifetime.Define(lifetime);
+      myLifetimeDefinition.AllowTerminationUnderExecution = true;
+      Proto.Wire.Advise(lifetime, this);
+
+      if (!myIsClientSide) 
+        myLifetimeDefinition.Lifetime.OnTermination(() => Proto.Wire.Send(RdId, writer => writer.Write(1)));
+    }
+
+    public override void OnWireReceived(UnsafeReader reader)
+    {
+      myLifetimeDefinition.Terminate();
+    }
+
+    /// <summary>
+    /// Used on a sender side to 
+    /// </summary>
+    public void AttachToLifetime(Lifetime lifetime)
+    {
+      if (!lifetime.TryOnTermination(myLifetimeDefinition))
+        myLifetimeDefinition.Terminate();
+    }
+
+    #region Intrinsic
+
+    public static RdOuterLifetime Read(SerializationCtx ctx, UnsafeReader reader)
+    {
+      var id = reader.ReadRdId();
+      var rdOuterLifetime = new RdOuterLifetime()
+      {
+        myIsClientSide = true
+      }.WithId(id);
+      return rdOuterLifetime;
+    }
+
+    public static void Write(SerializationCtx ctx, UnsafeWriter writer, RdOuterLifetime value)
+    {
+      writer.Write(value.RdId);
+    }
+
+    #endregion
+  }
+}
\ No newline at end of file
diff --git a/rd-net/RdFramework.Reflection/ReflectionRdActivator.cs b/rd-net/RdFramework.Reflection/ReflectionRdActivator.cs
index 9dbc01a97..7a2999aea 100644
--- a/rd-net/RdFramework.Reflection/ReflectionRdActivator.cs
+++ b/rd-net/RdFramework.Reflection/ReflectionRdActivator.cs
@@ -143,7 +143,9 @@ private object ActivateRd(Type type)
 #endif
 
       var typeInfo = type.GetTypeInfo();
-      ReflectionSerializerVerifier.AssertEitherExtModelAttribute(typeInfo);
+      if (!ReflectionSerializerVerifier.IsSealedClassAssignableFromIRdBindable(typeInfo))
+        ReflectionSerializerVerifier.AssertEitherExtModelAttribute(typeInfo);
+
       var implementingType = ReflectionSerializerVerifier.GetImplementingType(typeInfo);
       Assertion.Assert(typeof(RdBindableBase).GetTypeInfo().IsAssignableFrom(implementingType),
         $"Unable to activate {type.FullName}: type should be {nameof(RdBindableBase)}");
diff --git a/rd-net/RdFramework.Reflection/ReflectionSerializerVerifier.cs b/rd-net/RdFramework.Reflection/ReflectionSerializerVerifier.cs
index 250443190..b55e71af1 100644
--- a/rd-net/RdFramework.Reflection/ReflectionSerializerVerifier.cs
+++ b/rd-net/RdFramework.Reflection/ReflectionSerializerVerifier.cs
@@ -187,7 +187,7 @@ private static bool IsMemberType(TypeInfo typeInfo)
                genericDefinition == typeof(RdMap<,>) ||                          // TResponse can be LiveModel
                (genericDefinition == typeof(RdCall<,>) && IsScalar(arguments[0]) /*&& IsScalar(arguments[1])*/) ||
                // Custom classes support
-               (typeInfo.IsClass && typeInfo.IsSealed && typeof(IRdBindable).IsAssignableFrom(typeInfo));
+               (IsSealedClassAssignableFromIRdBindable(typeInfo));
       }
 
       if (IsScalar(typeInfo))
@@ -201,9 +201,18 @@ private static bool IsMemberType(TypeInfo typeInfo)
       if (hasRdModel)
         return true;
 
+      // Custom classes support
+      if (IsSealedClassAssignableFromIRdBindable(typeInfo))
+        return true;
+
       return false;
     }
 
+    public static bool IsSealedClassAssignableFromIRdBindable(TypeInfo typeInfo)
+    {
+      return typeInfo.IsClass && typeInfo.IsSealed && typeof(IRdBindable).IsAssignableFrom(typeInfo);
+    }
+
     public static bool IsScalar(Type type)
     {
       return !typeof(IRdBindable).IsAssignableFrom(type);
@@ -212,7 +221,7 @@ public static bool IsScalar(Type type)
     public static void AssertEitherExtModelAttribute(TypeInfo type)
     {
       /*Assertion.Assert((HasRdExtAttribute(type) || HasRdModelAttribute(type)), $"Invalid RdModel: expected to have either {nameof(RdModelAttribute)} or {nameof(RdExtAttribute)} ({type.ToString(true)}).");*/
-      Assertion.Assert(HasRdExtAttribute(type) ^ HasRdModelAttribute(type), $"Invalid RdModel {type.ToString(true)}: expected to have only one of {nameof(RdModelAttribute)} or {nameof(RdExtAttribute)}.");
+      Assertion.Assert(HasRdExtAttribute(type) ^ HasRdModelAttribute(type), $"Invalid RdModel {type.ToString(true)}: expected to have only one of {nameof(RdModelAttribute)} or {nameof(RdExtAttribute)} or be a sealed class assignable from {nameof(IRdBindable)}.");
     }
 
     public static void AssertRoot(TypeInfo type)
diff --git a/rd-net/Test.RdFramework/RdOuterLifetimeTest.cs b/rd-net/Test.RdFramework/RdOuterLifetimeTest.cs
new file mode 100644
index 000000000..5c8993634
--- /dev/null
+++ b/rd-net/Test.RdFramework/RdOuterLifetimeTest.cs
@@ -0,0 +1,69 @@
+using JetBrains.Collections.Viewable;
+using JetBrains.Lifetimes;
+using JetBrains.Rd.Reflection;
+using NUnit.Framework;
+using Test.RdFramework.Reflection;
+
+namespace Test.RdFramework
+{
+  [TestFixture]
+  public class RdOuterLifetimeTest: RdReflectionTestBase
+  {
+    private Root myS;
+    private Root myC;
+
+    [RdExt]
+    public sealed class Root : RdExtReflectionBindableBase
+    {
+      public IViewableProperty<Model> PolyProperty { get; }
+    }
+
+    [RdModel]
+    public sealed class Model : RdReflectionBindableBase
+    {
+      public RdOuterLifetime OuterLifetime { get; }
+    }
+
+    public override void SetUp()
+    {
+      base.SetUp();
+      myS = SFacade.InitBind(new Root(), TestLifetime, ClientProtocol);
+      myC = CFacade.InitBind(new Root(), TestLifetime, ServerProtocol);
+    }
+
+    [Test]
+    public void Test01()
+    {
+      Lifetime.Using(lifetime =>
+      {
+        bool sTerminated = false;
+        var m = CFacade.Activator.Activate<Model>();
+        myC.PolyProperty.Value = m;
+        var ld2 = OuterLifetime.DefineIntersection(lifetime, myS.PolyProperty.Value.OuterLifetime);
+        ld2.Lifetime.OnTermination(() => sTerminated = true);
+
+        Lifetime.Using(outerLifetime => m.OuterLifetime.AttachToLifetime(outerLifetime));
+
+        Assert.IsTrue(sTerminated, "sTerminated");
+      });
+    }
+
+    [Test]
+    public void TestTerminatedLifetime01()
+    {
+      Lifetime.Using(lifetime =>
+      {
+        bool sTerminated = false;
+        var m = CFacade.Activator.Activate<Model>();
+        myC.PolyProperty.Value = m;
+        var ld2 = OuterLifetime.DefineIntersection(lifetime, myS.PolyProperty.Value.OuterLifetime);
+        ld2.Lifetime.OnTermination(() => sTerminated = true);
+
+        var lifetimeDefinition = Lifetime.Define(lifetime);
+        lifetimeDefinition.Terminate();
+        m.OuterLifetime.AttachToLifetime(lifetimeDefinition.Lifetime);
+        Assert.IsTrue(sTerminated, "sTerminated");
+      });
+    }
+  }
+}
\ No newline at end of file