non-threaded J Series Tear-Tab Caps for NPT Pipe Threads J Series tear-tab caps for NPT pipe threads feature a time-saving tear-tab cap that slips easily over male NPT threaded fittings and snaps securely in place. A ribbed wide tear-tab allows for easy removal. * Covers NPT thread * Easy installation and removal * Locks onto threads Material: Low-Density Polyethylene Color: Blue JS Series Tear-Tab Caps for Straight Threads JS Series tear-tab caps for straight threads feature an extra-wide ribbed tab for easy removal. * Natural color * Vast range of sizes Material: Low-Density Polyethylene Color: Natural (Black in carton qty. only) MJ Series Tear-Tab Caps for Tapered Metric Threads MJ Series tear-tab caps for tapered metric threads feature a locking bead that engages lead thread and holds cap on securely. A tear-tab breaks the seal for easy removal. Material: Low-Density Polyethylene Color: Red 48 * For other material and color options, contact customer service.