Stockpile Covers Salt Pile Covers Salt pile covers have become very common as they are a less expensive alternative to rigid covers. Fits all pile shapes. Grain Bunker – Covers We can provide you with low cost high quality salt pile covers which are quick to deeply and quick to ship. Fits all pile shapes. Stockpile Covers We provide low cost high quality covers that are quick to ship and deploy. We offer both flat and conical style covers in any size.