Object pool with "Null Reference Exception" problem

Hello, I am trying to use an object pool for my pipes that will be coming into screen instead of instantiating them for better performance. I found a tutorial on youtube about object pools and changed the syntax to javaScript while changing everything to my own variables. The problem I am having is I get a "Null Reference Exception" because of these lines in my "SteamPipePool" Script:

    steamPipes[i].GetComponent("SteamPipeMove");
    steamPipeMove.Activate();

I think the Null reference is because I haven't been able to correctly setup my GetComponent to grab the script from each game object instantiated, but after trying multiple things I can't get it to work.

I have two scripts(one on the pipe Prefab and one on the Object pool manager in my scene). Currently I have my Update function in the "SteamPipePool" script enabled for testing with the mouse click.

If anyone could point me in the right direction I would be very grateful.

This is the script on my pipe prefab named "SteamPipeMove":

 var pipeLife : float = 3.0;
 var pipeSpeed : float = 10.0;
 private var timeToReturn : float = 0.0;
 
 function Start()
 {
     timeToReturn = Time.time + pipeLife;
 }
 
 function Update () 
 { 
     PipeMove();
     CountDown();
 }
 
 function PipeMove ()
 {
     transform.Translate(-pipeSpeed * Time.deltaTime, 0,0);
 }
 
 function Activate ()
 {
     timeToReturn = Time.time + pipeLife;
     transform.position = Vector3(11, 1, 0);
 }
 
 function Deactivate ()
 {
     gameObject.SetActive(false);
 }
 
 function CountDown ()
 {
     if(timeToReturn < Time.time)
     {
         Debug.Log("Hit");
         Deactivate();
     }
 }

And this is the script I have on my Object Pool Manager named "SteamPipePool":

 var moveTimeMin : float = 1.0;
 var moveTimeMax : float = 2.3;
 var pipe : Transform;
 var steamPipes : GameObject[] = null;
 var numberOfPipes : int = 6;
 private var steamPipeMove : SteamPipeMove;
 private var i : int;
 
 function Start()
 {
     steamPipes = new GameObject[numberOfPipes];
     InstantiatePipes();
 }
 
 function Update () 
 {
     //To test the whole thing
     if(Input.GetMouseButton(0) == true)
     {
         ActivatePipes();
     }
 }
 
 function InstantiatePipes()
 {
     for( i = 0; i < numberOfPipes; i++)
     {
         steamPipes[i] = Instantiate(pipe.gameObject,Vector3(13,1,0),Quaternion.identity)as GameObject;
         steamPipes[i].SetActive(false);
     }
 }
 
 function ActivatePipes()
 {
     for( i = 0; i < numberOfPipes; i++)
     {
         if(steamPipes[i].activeInHierarchy == false)
         {
             steamPipes[i].SetActive(true);
             steamPipes[i].GetComponent("SteamPipeMove");
             steamPipeMove.Activate();
             return;
         
         }
     }
 }

Eventually I want to alternate different pipes randomly instead of just one pipe but I think I need to get this working first.

Thanks for the help!