diff --git a/common/mekanism/api/gas/GasTank.java b/common/mekanism/api/gas/GasTank.java
index d4f2e27ec..10614ef69 100644
--- a/common/mekanism/api/gas/GasTank.java
+++ b/common/mekanism/api/gas/GasTank.java
@@ -115,6 +115,21 @@ public class GasTank
 		return true;
 	}
 	
+	/**
+	 * If this GasTank can receive the specified type of gas. Will return TRUE if this tank does not need anymore gas.
+	 * @param gas - gas to check
+	 * @return if this GasTank can accept the defined gas
+	 */
+	public boolean canReceiveType(Gas gas)
+	{
+		if(stored != null && (gas != null && gas != stored.getGas()))
+		{
+			return false;
+		}
+		
+		return true;
+	}
+	
 	/**
 	 * If this GasTank can be drawn of the specified type of gas. Will return false if this tank does not contain any gas.
 	 * @param gas - gas to check
diff --git a/common/mekanism/client/gui/GuiElectrolyticSeparator.java b/common/mekanism/client/gui/GuiElectrolyticSeparator.java
old mode 100644
new mode 100755
index 9741171ea..521410bd0
--- a/common/mekanism/client/gui/GuiElectrolyticSeparator.java
+++ b/common/mekanism/client/gui/GuiElectrolyticSeparator.java
@@ -86,6 +86,9 @@ public class GuiElectrolyticSeparator extends GuiMekanism
         
 		name = tileEntity.dumpRight ? "Dumping..." : tileEntity.rightTank.getGas() == null ? MekanismUtils.localize("gui.none") : tileEntity.rightTank.getGas().getGas().getLocalizedName();
         fontRenderer.drawString(name, 156-fontRenderer.getStringWidth(name), 73, 0x404040);
+		
+		name = tileEntity.dumpExcess ? "Dumping Excess" : "Stop when full";
+		fontRenderer.drawString(name, 97, 6, 0x404040);
 
 		if(xAxis >= 6 && xAxis <= 22 && yAxis >= 11 && yAxis <= 69)
 		{
@@ -123,6 +126,9 @@ public class GuiElectrolyticSeparator extends GuiMekanism
         
         int rightDisplay = tileEntity.dumpRight ? 60 : 52;
         drawTexturedModalRect(guiWidth + 160, guiHeight + 73, 176, rightDisplay, 8, 8);
+		
+		int dumpDisplay = tileEntity.dumpExcess ? 60 : 52;
+		drawTexturedModalRect(guiWidth + 84, guiHeight + 6, 176, dumpDisplay, 8, 8);
         
         int displayInt;
         
diff --git a/common/mekanism/common/tile/TileEntityElectrolyticSeparator.java b/common/mekanism/common/tile/TileEntityElectrolyticSeparator.java
index 600f122df..b79c39576 100644
--- a/common/mekanism/common/tile/TileEntityElectrolyticSeparator.java
+++ b/common/mekanism/common/tile/TileEntityElectrolyticSeparator.java
@@ -62,6 +62,9 @@ public class TileEntityElectrolyticSeparator extends TileEntityElectricBlock imp
 	
 	/** Type type of gas this block is dumping. */
 	public boolean dumpRight = false;
+	
+	/** Whether to dump excess gas when a tank is full */
+	public boolean dumpExcess = true; // default to true until gui elements added
 
 	public TileEntityElectrolyticSeparator()
 	{
@@ -199,6 +202,11 @@ public class TileEntityElectrolyticSeparator extends TileEntityElectricBlock imp
 	
 	public boolean canFill(ChemicalPair gases)
 	{
+		if(dumpExcess)
+		{
+			return (leftTank.canReceiveType(gases.leftGas.getGas()) && rightTank.canReceiveType(gases.rightGas.getGas())) 
+		}
+					
 		return (leftTank.canReceive(gases.leftGas.getGas()) && leftTank.getNeeded() >= gases.leftGas.amount
 				&& rightTank.canReceive(gases.rightGas.getGas()) && rightTank.getNeeded() >= gases.rightGas.amount);
 	}
diff --git a/resources/assets/mekanism/gui/GuiElectrolyticSeparator.png b/resources/assets/mekanism/gui/GuiElectrolyticSeparator.png
index 13b91156d..9c6e486c5 100644
Binary files a/resources/assets/mekanism/gui/GuiElectrolyticSeparator.png and b/resources/assets/mekanism/gui/GuiElectrolyticSeparator.png differ