threaded MT Series Metric Sealing Plugs MT Series are designed to protect metric fittings with five complete threads to provide a tight fit and secure seal. May be applied or removed with a screwdriver, socket wrench or manually. Material: Nylon 6 Color: Yellow P Series Plastic Threaded Plugs for Pipe Fittings P Series plastic threaded plugs are available in six different styles for tapered and straight threads. Designed to keep out moisture, dirt and other contaminants in pipe fittings. Material: High-Density Polyethylene Color: Red Head designed to fit 9/16" 12-point socket or wrench Head designed to fit 12-point socket or wrench Serrations equally spaced This style is suitable for optional gasketing. † Material: Polypropylene Caplugs Nos. P-18B thru P-68B Caplugs No. P-48C Straight Threads Caplugs No. P-68VH 124 * For other material and color options, contact customer service.