non-threaded PM Series Push-On Metric Caps PM Series push-on metric caps are durable caps with a flange for easy installation and removal. The versatile design enables the cap to be reused on a wide variety of threaded and non-threaded fittings. * Fits common metric thread sizes RECESSED GATE Material: Low-Density Polyethylene Color: Yellow Tint D C A PN Series Push-On NPT Caps PN Series push-on NPT caps are durable with a flange for easy installation and removal. The versatile design enables the cap to be reused on a wide variety of threaded and non-threaded fittings. * Fits common NPT thread sizes RECESSED GATE D B Material: Low-Density Polyethylene Color: Red Tint .060 C A PO Series Push-On Straight-Thread Caps PO Series push-on straight-thread caps are designed to protect straight threads with or without O-rings, yet the versatile design allows for use on a variety of threaded or non-threaded fittings. * Protects straight threads Material: Low-Density Polyethylene Color: Natural D RECESSED GATE C A 52 * For other material and color options, contact customer service.