THese durable pipe capsoffer excellent protection against impact damage and prohibit debris from entering pipe. Parts CE-309 through CE-327 are designed with an NPT taper. All other parts are straight walled. The part number listed in red text indicates pipe caps with a new patent-pending design. These caps feature internal ribs for ventilation and a flexible skirt for easy installation and removal. The protection they provide will save you time and money. No more time wasted reworking damaged pipe ends; resulting in faster installations and more time available for other projects, are just some of the benefits that these pipe caps provide.