diff --git a/include/cantera/zeroD/FlowDevice.h b/include/cantera/zeroD/FlowDevice.h
index f4a62e20d..aac16f58f 100644
--- a/include/cantera/zeroD/FlowDevice.h
+++ b/include/cantera/zeroD/FlowDevice.h
@@ -24,6 +24,8 @@ class ReactorBase;
 class FlowDevice : public ConnectorNode
 {
 public:
+    FlowDevice(shared_ptr<ReactorBase> r0, shared_ptr<ReactorBase> r1,
+               const string& name="(none)");
     using ConnectorNode::ConnectorNode;  // inherit constructors
 
     string type() const override {
@@ -55,6 +57,8 @@ public:
     /*!
      * @param in Upstream reactor.
      * @param out Downstream reactor.
+     * @deprecated To be removed after Cantera 3.2. Reactors should be provided to
+     *      constructor instead.
      */
     bool install(ReactorBase& in, ReactorBase& out);
 
diff --git a/include/cantera/zeroD/Wall.h b/include/cantera/zeroD/Wall.h
index f5a941ef2..3e5269077 100644
--- a/include/cantera/zeroD/Wall.h
+++ b/include/cantera/zeroD/Wall.h
@@ -22,6 +22,8 @@ class Func1;
 class WallBase : public ConnectorNode
 {
 public:
+    WallBase(shared_ptr<ReactorBase> r0, shared_ptr<ReactorBase> r1,
+             const string& name="(none)");
     using ConnectorNode::ConnectorNode;  // inherit constructors
 
     string type() const override {
@@ -58,6 +60,8 @@ public:
     virtual void setArea(double a);
 
     //! Install the wall between two reactors or reservoirs
+    //! @deprecated To be removed after Cantera 3.2. Reactors should be provided to
+    //!     constructor instead.
     bool install(ReactorBase& leftReactor, ReactorBase& rightReactor);
 
     //! Called just before the start of integration
diff --git a/src/zeroD/ConnectorFactory.cpp b/src/zeroD/ConnectorFactory.cpp
index e48012810..b947fbf6a 100644
--- a/src/zeroD/ConnectorFactory.cpp
+++ b/src/zeroD/ConnectorFactory.cpp
@@ -48,10 +48,6 @@ shared_ptr<ConnectorNode> newConnectorNode(
     const string& model,
     shared_ptr<ReactorBase> r0, shared_ptr<ReactorBase> r1, const string& name)
 {
-    if (!r0 || !r1) {
-        warn_deprecated("newConnectorNode",
-            "Instantiation of empty connector nodes to be removed after Cantera 3.2.");
-    }
     return shared_ptr<ConnectorNode>(
         ConnectorFactory::factory()->create(model, r0, r1, name));
 }
diff --git a/src/zeroD/FlowDevice.cpp b/src/zeroD/FlowDevice.cpp
index d298a933c..34903390e 100644
--- a/src/zeroD/FlowDevice.cpp
+++ b/src/zeroD/FlowDevice.cpp
@@ -11,8 +11,45 @@
 namespace Cantera
 {
 
+FlowDevice::FlowDevice(shared_ptr<ReactorBase> r0, shared_ptr<ReactorBase> r1,
+                       const string& name) : ConnectorNode(r0, r1, name)
+{
+    if (!m_nodes.first || !m_nodes.second) {
+        warn_deprecated("FlowDevice::FlowDevice",
+            "After Cantera 3.1, Reactors must be provided to a FlowDevice "
+            "constructor.");
+        return;
+    }
+    m_in = r0.get();
+    m_out = r1.get();
+    m_in->addOutlet(*this);
+    m_out->addInlet(*this);
+
+    // construct adapters between inlet and outlet species
+    const ThermoPhase& mixin = m_in->contents();
+    const ThermoPhase& mixout = m_out->contents();
+
+    m_nspin = mixin.nSpecies();
+    m_nspout = mixout.nSpecies();
+    string nm;
+    size_t ki, ko;
+    for (ki = 0; ki < m_nspin; ki++) {
+        nm = mixin.speciesName(ki);
+        ko = mixout.speciesIndex(nm);
+        m_in2out.push_back(ko);
+    }
+    for (ko = 0; ko < m_nspout; ko++) {
+        nm = mixout.speciesName(ko);
+        ki = mixin.speciesIndex(nm);
+        m_out2in.push_back(ki);
+    }
+}
+
 bool FlowDevice::install(ReactorBase& in, ReactorBase& out)
 {
+    warn_deprecated("FlowDevice::install",
+        "To be removed after Cantera 3.1. Reactors should be provided to constructor "
+        "instead.");
     if (m_in || m_out) {
         throw CanteraError("FlowDevice::install", "Already installed");
     }
diff --git a/src/zeroD/Wall.cpp b/src/zeroD/Wall.cpp
index 519e80f85..9d638c328 100644
--- a/src/zeroD/Wall.cpp
+++ b/src/zeroD/Wall.cpp
@@ -10,8 +10,26 @@
 namespace Cantera
 {
 
+WallBase::WallBase(shared_ptr<ReactorBase> r0, shared_ptr<ReactorBase> r1,
+                   const string& name) : ConnectorNode(r0, r1, name)
+{
+    if (!m_nodes.first || !m_nodes.second) {
+        warn_deprecated("FlowDevice::FlowDevice",
+            "After Cantera 3.2, Reactors must be provided to a FlowDevice "
+            "constructor.");
+        return;
+    }
+    m_left = r0.get();
+    m_right = r1.get();
+    m_left->addWall(*this, 0);
+    m_right->addWall(*this, 1);
+}
+
 bool WallBase::install(ReactorBase& rleft, ReactorBase& rright)
 {
+    warn_deprecated("WallBase::install",
+        "To be removed after Cantera 3.2. Reactors should be provided to constructor "
+        "instead.");
     // check if wall is already installed
     if (m_left || m_right) {
         return false;