diff --git a/src/Plugin/Field/FieldType/SerialItem.php b/src/Plugin/Field/FieldType/SerialItem.php
index e21f56b..ef366e1 100644
--- a/src/Plugin/Field/FieldType/SerialItem.php
+++ b/src/Plugin/Field/FieldType/SerialItem.php
@@ -194,6 +194,7 @@ class SerialItem extends FieldItemBase {
     $serial = NULL;
     $entity = $this->getEntity();
     $newSerial = FALSE;
+    $newValue = NULL;
 
     // Does not apply if the node is not new or translated.
     if ($entity->isNew()) {
@@ -213,9 +214,12 @@ class SerialItem extends FieldItemBase {
     }
 
     if ($newSerial) {
+      if (isset($this->value) && (int)$this->value !== -1) {
+        $newValue = $this->value;
+      }
       /** @var \Drupal\serial\SerialStorageInterface $serialStorage */
       $serialStorage = \Drupal::getContainer()->get('serial.sql_storage');
-      $serial = $serialStorage->generateValue($this->getFieldDefinition(), $this->getEntity());
+      $serial = $serialStorage->generateValue($this->getFieldDefinition(), $this->getEntity(), $newValue);
 
       // Get the starting value from the storage settings.
       $settings = $this->getSettings();
diff --git a/src/Plugin/Field/FieldWidget/SerialDefaultWidget.php b/src/Plugin/Field/FieldWidget/SerialDefaultWidget.php
index dceed9f..ea21baf 100644
--- a/src/Plugin/Field/FieldWidget/SerialDefaultWidget.php
+++ b/src/Plugin/Field/FieldWidget/SerialDefaultWidget.php
@@ -30,7 +30,7 @@ class SerialDefaultWidget extends WidgetBase {
       // throws 'This value should be of the correct primitive type'.
       // @see https://www.drupal.org/node/2220381
       // so the serial is defaulted to a positive int.
-      '#default_value' => isset($items[$delta]->value) ? $items[$delta]->value : 1,
+      '#default_value' => isset($items[$delta]->value) ? $items[$delta]->value : -1,
     ];
     return $element;
   }
diff --git a/src/SerialSQLStorage.php b/src/SerialSQLStorage.php
index 99735bb..a4a606c 100644
--- a/src/SerialSQLStorage.php
+++ b/src/SerialSQLStorage.php
@@ -3,6 +3,7 @@
 namespace Drupal\serial;
 
 use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\Entity\FieldableEntityInterface;
 use Drupal\Core\Field\FieldDefinitionInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -37,7 +38,7 @@ class SerialSQLStorage implements ContainerInjectionInterface, SerialStorageInte
    * {@inheritdoc}
    */
   public function __construct(QueryFactory $entityQuery,
-                              EntityTypeManager $entityTypeManager) {
+                              EntityTypeManagerInterface $entityTypeManager) {
     $this->entityQuery = $entityQuery;
     $this->entityTypeManager = $entityTypeManager;
   }
@@ -77,7 +78,7 @@ class SerialSQLStorage implements ContainerInjectionInterface, SerialStorageInte
   /**
    * {@inheritdoc}
    */
-  public function generateValueFromName($storageName, $delete = TRUE) {
+  public function generateValueFromName($storageName, $value, $delete = TRUE) {
     $connection = Database::getConnection();
     // @todo review https://api.drupal.org/api/drupal/core%21includes%21database.inc/function/db_transaction/8.2.x
     $transaction = $connection->startTransaction();
@@ -85,9 +86,17 @@ class SerialSQLStorage implements ContainerInjectionInterface, SerialStorageInte
     try {
       // Insert a temporary record to get a new unique serial value.
       $uniqid = uniqid('', TRUE);
-      $sid = $connection->insert($storageName)
-        ->fields(['uniqid' => $uniqid])
-        ->execute();
+
+      if (isset($value)) {
+        $sid = $connection->insert($storageName)
+          ->fields(['sid' => $value, 'uniqid' => $uniqid])
+          ->execute();
+      }
+      else {
+        $sid = $connection->insert($storageName)
+          ->fields(['uniqid' => $uniqid])
+          ->execute();
+      }
 
       // If there's a reason why it's come back undefined, reset it.
       $sid = isset($sid) ? $sid : 0;
@@ -116,9 +125,10 @@ class SerialSQLStorage implements ContainerInjectionInterface, SerialStorageInte
    */
   public function generateValue(FieldDefinitionInterface $fieldDefinition,
                                 FieldableEntityInterface $entity,
+                                int $value = NULL,
                                 $delete = TRUE) {
     $storageName = $this->createStorageNameFromField($fieldDefinition, $entity);
-    return $this->generateValueFromName($storageName, $delete);
+    return $this->generateValueFromName($storageName, $value, $delete);
   }
 
   /**
diff --git a/src/SerialStorageInterface.php b/src/SerialStorageInterface.php
index d7b302f..7c167f5 100644
--- a/src/SerialStorageInterface.php
+++ b/src/SerialStorageInterface.php
@@ -46,13 +46,15 @@ interface SerialStorageInterface {
    *
    * @param string $storageName
    *   Storage name.
+   * @param int $value
+   *   Existing value to insert
    * @param bool $delete
    *   Indicates if temporary records should be deleted.
    *
    * @return int
    *   Unique serial id.
    */
-  public function generateValueFromName($storageName, $delete = TRUE);
+  public function generateValueFromName($storageName, int $value, $delete = TRUE);
 
   /**
    * Generates a unique serial value (unique per entity bundle).
@@ -61,13 +63,15 @@ interface SerialStorageInterface {
    *   Field definition.
    * @param \Drupal\Core\Entity\FieldableEntityInterface $entity
    *   Entity.
+   * @param int $value
+   *   Existing value to insert
    * @param bool $delete
    *   Indicates if temporary records should be deleted.
    *
    * @return int
    *   Unique serial id.
    */
-  public function generateValue(FieldDefinitionInterface $fieldDefinition, FieldableEntityInterface $entity, $delete = TRUE);
+  public function generateValue(FieldDefinitionInterface $fieldDefinition, FieldableEntityInterface $entity, int $value, $delete = TRUE);
 
   /**
    * Gets the schema of the assistant storage for generating serial values.