Disable Box Collider on Tagged Object

I’m building a simple game and one of the mechanics are pickups/collectables that do certain things. I have a few things in my scene. Player, pickup (FireProof) some fire, obstacles and a finish line. I’m trying to make it so when the player collides with the object tagged “FireProof” it removes the box colliders on any game objects tagged as “Fire” but I don’t know how to do it.

using UnityEngine;
using System.Collections;

public class Lvl1GameLogic : MonoBehaviour {

	public bool IsFireProof;

	void Awake(){
		IsFireProof = false;
	}

	void OnCollisionEnter (Collision col)
	{
		if(col.gameObject.tag == "FireProof")
		{
			Destroy(col.gameObject);
			IsFireProof = true;
		}

		if(col.gameObject.tag == "Fire")
		{
			if(IsFireProof == true) {
				// disable box collider
			}
			else {
			Application.LoadLevel(1);
			}
		}

		if(col.gameObject.tag == "Obstacle")
		{
			Application.LoadLevel(1);
		}

		if(col.gameObject.tag == "Finish")
		{
			Application.LoadLevel(2);
		}

	}

}

Any help is appreciated.

Depending on intended behaviour you can use

col.collider.SetActive(false); 

or

GameObject.Destroy(col.collider);

This is what eventually worked

if(col.gameObject.tag == "Fire")
		{
			if(IsFireProof == true) {
				Destroy(col.collider);
			}
			else {
			Application.LoadLevel(1);
			}
		}