diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index a07fdea..cf76c88 100644
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartstream',
-  version: '3.0.25',
+  version: '3.0.26',
   description: 'simplifies access to node streams'
 }
diff --git a/ts/smartstream.classes.smartduplex.ts b/ts/smartstream.classes.smartduplex.ts
index 2dec39e..dc4bbe2 100644
--- a/ts/smartstream.classes.smartduplex.ts
+++ b/ts/smartstream.classes.smartduplex.ts
@@ -35,7 +35,7 @@ export class SmartDuplex<TInput = any, TOutput = any> extends Duplex {
   }
 
   // INSTANCE
-  private backpressuredArray = new plugins.lik.BackpressuredArray<TOutput>();
+  private backpressuredArray: plugins.lik.BackpressuredArray<TOutput>;
   public options: ISmartDuplexOptions<TInput, TOutput>;
   private observableSubscription?: plugins.smartrx.rxjs.Subscription;
   private debugLog(messageArg: string) {
@@ -45,8 +45,11 @@ export class SmartDuplex<TInput = any, TOutput = any> extends Duplex {
   }
 
   constructor(optionsArg?: ISmartDuplexOptions<TInput, TOutput>) {
-    super(optionsArg);
+    super(Object.assign({
+      highWaterMark: 1,
+    }, optionsArg));
     this.options = optionsArg;
+    this.backpressuredArray = new plugins.lik.BackpressuredArray<TOutput>(this.options.highWaterMark || 1)
   }
 
   public async _read(size: number): Promise<void> {