diff --git a/src/main/java/teetime/framework/pipe/OrderedGrowableArrayPipeFactory.java b/src/main/java/teetime/framework/pipe/OrderedGrowableArrayPipeFactory.java
index b67d7f0f521c5d948f27927ab4a500acd0152b73..a7a6151b33b890909db8a6d4957a1c3d25d4abe9 100644
--- a/src/main/java/teetime/framework/pipe/OrderedGrowableArrayPipeFactory.java
+++ b/src/main/java/teetime/framework/pipe/OrderedGrowableArrayPipeFactory.java
@@ -7,8 +7,6 @@ import teetime.framework.pipe.PipeFactoryRegistry.ThreadCommunication;
 
 public class OrderedGrowableArrayPipeFactory implements IPipeFactory {
 
-	public OrderedGrowableArrayPipeFactory() {}
-
 	@Override
 	public <T> IPipe create(final OutputPort<? extends T> sourcePort, final InputPort<T> targetPort) {
 		return this.create(sourcePort, targetPort, 4);
diff --git a/src/main/java/teetime/framework/pipe/SingleElementPipeFactory.java b/src/main/java/teetime/framework/pipe/SingleElementPipeFactory.java
index d888e4c0239eb6c7f4c2b6be8ea383f744d52176..4325fbba66f3b2f6536d952fb170fa033a3802d5 100644
--- a/src/main/java/teetime/framework/pipe/SingleElementPipeFactory.java
+++ b/src/main/java/teetime/framework/pipe/SingleElementPipeFactory.java
@@ -7,8 +7,6 @@ import teetime.framework.pipe.PipeFactoryRegistry.ThreadCommunication;
 
 public class SingleElementPipeFactory implements IPipeFactory {
 
-	public SingleElementPipeFactory() {}
-
 	@Override
 	public <T> IPipe create(final OutputPort<? extends T> sourcePort, final InputPort<T> targetPort) {
 		return this.create(sourcePort, targetPort, 1);
diff --git a/src/main/java/teetime/framework/pipe/SpScPipeFactory.java b/src/main/java/teetime/framework/pipe/SpScPipeFactory.java
index e5e76c573f85b3d306e211635d4b9d9b0f51963d..9c7b9bd7c5e42305033e792d732622ed2cbd7cf4 100644
--- a/src/main/java/teetime/framework/pipe/SpScPipeFactory.java
+++ b/src/main/java/teetime/framework/pipe/SpScPipeFactory.java
@@ -7,8 +7,6 @@ import teetime.framework.pipe.PipeFactoryRegistry.ThreadCommunication;
 
 public class SpScPipeFactory implements IPipeFactory {
 
-	public SpScPipeFactory() {}
-
 	@Override
 	public <T> IPipe create(final OutputPort<? extends T> sourcePort, final InputPort<T> targetPort) {
 		return this.create(sourcePort, targetPort, 4);
diff --git a/src/main/java/teetime/framework/pipe/UnorderedGrowablePipeFactory.java b/src/main/java/teetime/framework/pipe/UnorderedGrowablePipeFactory.java
index 38e1d6692cbb91ea34b0cf97b96bd3ee9ea9a170..159b108e18bc7505b2a1a86c8ccc63ba05fd32f8 100644
--- a/src/main/java/teetime/framework/pipe/UnorderedGrowablePipeFactory.java
+++ b/src/main/java/teetime/framework/pipe/UnorderedGrowablePipeFactory.java
@@ -7,8 +7,6 @@ import teetime.framework.pipe.PipeFactoryRegistry.ThreadCommunication;
 
 public class UnorderedGrowablePipeFactory implements IPipeFactory {
 
-	public UnorderedGrowablePipeFactory() {}
-
 	@Override
 	public <T> IPipe create(final OutputPort<? extends T> sourcePort, final InputPort<T> targetPort) {
 		return this.create(sourcePort, targetPort, 4);