diff --git a/src/main/java/refinedstorage/container/ContainerBase.java b/src/main/java/refinedstorage/container/ContainerBase.java
index 3a9cf64ad..6e6953cd2 100755
--- a/src/main/java/refinedstorage/container/ContainerBase.java
+++ b/src/main/java/refinedstorage/container/ContainerBase.java
@@ -7,9 +7,7 @@ import net.minecraft.inventory.Slot;
 import net.minecraft.item.ItemStack;
 import net.minecraftforge.items.ItemHandlerHelper;
 import refinedstorage.api.storage.CompareUtils;
-import refinedstorage.container.slot.SlotDisabled;
-import refinedstorage.container.slot.SlotSpecimen;
-import refinedstorage.container.slot.SlotSpecimenLegacy;
+import refinedstorage.container.slot.*;
 import refinedstorage.tile.TileBase;
 import refinedstorage.tile.grid.WirelessGrid;
 
@@ -109,15 +107,17 @@ public abstract class ContainerBase extends Container {
 
     protected ItemStack mergeItemStackToSpecimen(ItemStack stack, int begin, int end) {
         for (int i = begin; i < end; ++i) {
-            if (CompareUtils.compareStackNoQuantity(getSlot(i).getStack(), stack)) {
+            if (CompareUtils.compareStackNoQuantity(getStackFromSlot(getSlot(i)), stack)) {
                 return null;
             }
         }
 
         for (int i = begin; i < end; ++i) {
-            if (!getSlot(i).getHasStack() && getSlot(i).isItemValid(stack)) {
-                getSlot(i).putStack(ItemHandlerHelper.copyStackWithSize(stack, 1));
-                getSlot(i).onSlotChanged();
+            Slot slot = getSlot(i);
+
+            if (getStackFromSlot(slot) == null && slot.isItemValid(stack)) {
+                slot.putStack(ItemHandlerHelper.copyStackWithSize(stack, 1));
+                slot.onSlotChanged();
 
                 return null;
             }
@@ -126,6 +126,20 @@ public abstract class ContainerBase extends Container {
         return null;
     }
 
+    private ItemStack getStackFromSlot(Slot slot) {
+        ItemStack stackInSlot = slot.getStack();
+
+        if (stackInSlot == null) {
+            if (slot instanceof SlotSpecimenFluid) {
+                stackInSlot = ((SlotSpecimenFluid) slot).getRealStack();
+            } else if (slot instanceof SlotSpecimenType) {
+                stackInSlot = ((SlotSpecimenType) slot).getRealStack();
+            }
+        }
+
+        return stackInSlot;
+    }
+
     @Override
     public boolean canInteractWith(EntityPlayer player) {
         return true;
diff --git a/src/main/java/refinedstorage/container/slot/SlotSpecimen.java b/src/main/java/refinedstorage/container/slot/SlotSpecimen.java
index 9d4930a92..c96aaedf0 100755
--- a/src/main/java/refinedstorage/container/slot/SlotSpecimen.java
+++ b/src/main/java/refinedstorage/container/slot/SlotSpecimen.java
@@ -38,7 +38,7 @@ public class SlotSpecimen extends SlotItemHandler {
 
     @Override
     public boolean isItemValid(ItemStack stack) {
-        return isBlockOnly() ? (stack.getItem() instanceof ItemBlock || stack.getItem() instanceof ItemBlockSpecial || stack.getItem() instanceof IPlantable) : true;
+        return super.isItemValid(stack) && (isBlockOnly() ? (stack.getItem() instanceof ItemBlock || stack.getItem() instanceof ItemBlockSpecial || stack.getItem() instanceof IPlantable) : true);
     }
 
     @Override
diff --git a/src/main/java/refinedstorage/container/slot/SlotSpecimenFluid.java b/src/main/java/refinedstorage/container/slot/SlotSpecimenFluid.java
index c319c700c..fb3917535 100755
--- a/src/main/java/refinedstorage/container/slot/SlotSpecimenFluid.java
+++ b/src/main/java/refinedstorage/container/slot/SlotSpecimenFluid.java
@@ -1,14 +1,23 @@
 package refinedstorage.container.slot;
 
+import net.minecraft.item.ItemStack;
 import net.minecraftforge.items.IItemHandler;
-import net.minecraftforge.items.SlotItemHandler;
 
-/**
- * Created by Raoul on 13/08/2016.
- */
-// @TODO: REMOVAL
-public class SlotSpecimenFluid extends SlotItemHandler {
-    public SlotSpecimenFluid(boolean b, IItemHandler filters, int i, int i1, int i2) {
-        super(filters, i, i1, i2);
+public class SlotSpecimenFluid extends SlotSpecimen {
+    private boolean server;
+
+    public SlotSpecimenFluid(boolean server, IItemHandler handler, int id, int x, int y) {
+        super(handler, id, x, y);
+
+        this.server = server;
+    }
+
+    @Override
+    public ItemStack getStack() {
+        return server ? super.getStack() : null;
+    }
+
+    public ItemStack getRealStack() {
+        return super.getStack();
     }
 }
\ No newline at end of file
diff --git a/src/main/java/refinedstorage/container/slot/SlotSpecimenType.java b/src/main/java/refinedstorage/container/slot/SlotSpecimenType.java
index 1111fd026..a0a20cb62 100755
--- a/src/main/java/refinedstorage/container/slot/SlotSpecimenType.java
+++ b/src/main/java/refinedstorage/container/slot/SlotSpecimenType.java
@@ -37,4 +37,8 @@ public class SlotSpecimenType extends SlotSpecimen {
     public ItemStack getStack() {
         return (type.getType() == IType.ITEMS || !((TileEntity) type).getWorld().isRemote) ? super.getStack() : null;
     }
+
+    public ItemStack getRealStack() {
+        return super.getStack();
+    }
 }