diff --git a/src/main/java/de/ellpeck/prettypipes/pipe/IPipeConnectable.java b/src/main/java/de/ellpeck/prettypipes/pipe/IPipeConnectable.java
index c9c3e86..ed8c71a 100644
--- a/src/main/java/de/ellpeck/prettypipes/pipe/IPipeConnectable.java
+++ b/src/main/java/de/ellpeck/prettypipes/pipe/IPipeConnectable.java
@@ -19,4 +19,8 @@ public interface IPipeConnectable {
     default ItemStack insertItem(World world, BlockPos pipePos, Direction direction, PipeItem item) {
         return item.stack;
     }
+
+    default boolean allowsModules(World world, BlockPos pipePos, Direction direction) {
+        return false;
+    }
 }
diff --git a/src/main/java/de/ellpeck/prettypipes/pipe/PipeBlock.java b/src/main/java/de/ellpeck/prettypipes/pipe/PipeBlock.java
index 1897415..bc1cec2 100644
--- a/src/main/java/de/ellpeck/prettypipes/pipe/PipeBlock.java
+++ b/src/main/java/de/ellpeck/prettypipes/pipe/PipeBlock.java
@@ -72,7 +72,7 @@ public class PipeBlock extends ContainerBlock implements IPipeConnectable {
         PipeTileEntity tile = Utility.getTileEntity(PipeTileEntity.class, worldIn, pos);
         if (tile == null)
             return ActionResultType.PASS;
-        if (!tile.isConnectedInventory())
+        if (!tile.canHaveModules())
             return ActionResultType.PASS;
         if (!worldIn.isRemote)
             NetworkHooks.openGui((ServerPlayerEntity) player, tile, pos);
@@ -185,7 +185,7 @@ public class PipeBlock extends ContainerBlock implements IPipeConnectable {
 
     public static void onStateChanged(World world, BlockPos pos, BlockState newState) {
         PipeTileEntity tile = Utility.getTileEntity(PipeTileEntity.class, world, pos);
-        if (tile != null && !tile.isConnectedInventory())
+        if (tile != null && !tile.canHaveModules())
             Utility.dropInventory(tile, tile.modules);
 
         PipeNetwork network = PipeNetwork.get(world);
diff --git a/src/main/java/de/ellpeck/prettypipes/pipe/PipeTileEntity.java b/src/main/java/de/ellpeck/prettypipes/pipe/PipeTileEntity.java
index a67eb78..147e8aa 100644
--- a/src/main/java/de/ellpeck/prettypipes/pipe/PipeTileEntity.java
+++ b/src/main/java/de/ellpeck/prettypipes/pipe/PipeTileEntity.java
@@ -228,8 +228,15 @@ public class PipeTileEntity extends TileEntity implements INamedContainerProvide
         return this.getItemHandler(dir, null) != null;
     }
 
-    public boolean isConnectedInventory() {
-        return Arrays.stream(Direction.values()).anyMatch(this::isConnectedInventory);
+    public boolean canHaveModules() {
+        for (Direction dir : Direction.values()) {
+            if (this.isConnectedInventory(dir))
+                return true;
+            IPipeConnectable connectable = this.getPipeConnectable(dir);
+            if (connectable != null && connectable.allowsModules(this.world, this.pos, dir))
+                return true;
+        }
+        return false;
     }
 
     public boolean canNetworkSee() {
diff --git a/src/main/java/de/ellpeck/prettypipes/terminal/ItemTerminalBlock.java b/src/main/java/de/ellpeck/prettypipes/terminal/ItemTerminalBlock.java
index dd09f82..1841643 100644
--- a/src/main/java/de/ellpeck/prettypipes/terminal/ItemTerminalBlock.java
+++ b/src/main/java/de/ellpeck/prettypipes/terminal/ItemTerminalBlock.java
@@ -77,6 +77,11 @@ public class ItemTerminalBlock extends ContainerBlock implements IPipeConnectabl
         return item.stack;
     }
 
+    @Override
+    public boolean allowsModules(World world, BlockPos pipePos, Direction direction) {
+        return true;
+    }
+
     @Override
     public BlockRenderType getRenderType(BlockState state) {
         return BlockRenderType.MODEL;