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diff --git a/extras/vom/vom/pipe.hpp b/extras/vom/vom/pipe.hpp
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+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __VOM_PIPE_H__
+#define __VOM_PIPE_H__
+
+#include "vom/interface.hpp"
+
+namespace VOM {
+/**
+ * A Pipe interface.
+ * A pipe is composed for 3 'interfaces'.
+ *  1) the 'parent' interface - this is used as the 'key' for the pipe
+ *  2) the two 'ends' of the pipe - these are used to RX/TX packets
+ *     form/to. The ends are retreivable using the east()/west() functions.
+ *     The east and west end are exactly equivalent, they are merely
+ *     named differently for logical purposes.
+ */
+class pipe : public interface
+{
+public:
+  typedef std::pair<handle_t, handle_t> handle_pair_t;
+
+  /**
+   * Construct a new object matching the desried state
+   */
+  pipe(uint32_t instance, admin_state_t state);
+
+  /**
+   * Destructor
+   */
+  ~pipe();
+
+  /**
+   * Copy Constructor
+   */
+  pipe(const pipe& o);
+
+  /**
+   * comparison operator - for UT
+   */
+  bool operator==(const pipe& s) const;
+
+  /**
+   * Return the matching 'singular instance' of the sub-interface
+   */
+  std::shared_ptr<pipe> singular() const;
+
+  /**
+   * Find a subinterface from its key
+   */
+  static std::shared_ptr<pipe> find(const key_t& k);
+
+  /**
+   * The interface that is the east end of the pipe
+   */
+  std::shared_ptr<interface> east();
+
+  /**
+   * The interface that is the west end of the pipe.
+   * The east and west end are exactly equivalent, they are merely
+   * named differently for logical purposes.
+   */
+  std::shared_ptr<interface> west();
+
+  virtual std::string to_string(void) const;
+
+  void set_ends(const handle_pair_t& p);
+
+private:
+  /**
+   * The interface type that forms the ends of the pipe
+   */
+  class pipe_end : public interface
+  {
+  public:
+    pipe_end(const pipe& p, uint8_t id);
+
+  private:
+    virtual std::queue<cmd*>& mk_create_cmd(std::queue<cmd*>& cmds);
+    virtual std::queue<cmd*>& mk_delete_cmd(std::queue<cmd*>& cmds);
+
+    std::shared_ptr<pipe> m_pipe;
+  };
+
+  /**
+*Class definition for listeners to OM events
+*/
+  class event_handler : public OM::listener, public inspect::command_handler
+  {
+  public:
+    event_handler();
+    virtual ~event_handler() = default;
+
+    /**
+     * Handle a populate event
+     */
+    void handle_populate(const client_db::key_t& key);
+
+    /**
+     * Handle a replay event
+     */
+    void handle_replay();
+
+    /**
+     * Show the object in the Singular DB
+     */
+    void show(std::ostream& os);
+
+    /**
+     * Get the sortable Id of the listener
+     */
+    dependency_t order() const;
+  };
+  static event_handler m_evh;
+
+  /**
+   * Return the matching 'instance' of the pipe
+   *  over-ride from the base class
+   */
+  std::shared_ptr<interface> singular_i() const;
+
+  /**
+   * Virtual functions to construct an interface create commands.
+   */
+  virtual std::queue<cmd*>& mk_create_cmd(std::queue<cmd*>& cmds);
+
+  /**
+   * Virtual functions to construct an interface delete commands.
+   */
+  virtual std::queue<cmd*>& mk_delete_cmd(std::queue<cmd*>& cmds);
+
+  /**
+   * the handles that are set during the create command
+   */
+  HW::item<handle_pair_t> m_hdl_pair;
+
+  /**
+   * The ends of the pipe
+   */
+  std::shared_ptr<interface> m_ends[2];
+
+  /**
+   * Instance number
+   */
+  uint32_t m_instance;
+};
+
+}; // namespace VOM
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "mozilla")
+ * End:
+ */
+
+#endif