Need to replace the original equipment on your plastic IBC tanks? These caps will do just the job. If you need to attach a pump, you may want to use the PBC6PS, as it has a 2 inch NPS opening in the center with a solid polyethylene plug and a Santoprene gasket. The Santoprene gaskets are a high performing long-term material that is resistant to flex fatigue, harsh temperatures and chemicals. Standard caps may work if you just need to replace your old caps. In all cases, these caps will help you keep your product protected.