Natural rubber threaded O-ring for a positive seal Black color blends well with cast-iron pipe NPT-sized, including hard-to-find 3-1/2 in. Guaranteed to seal any damaged threads ABS glass-reinforced plastic for added strength

Natural threaded O-ring for a positive seal Black color blends well with cast-iron pipe NPT-sized, including hard-to-find 3-1/2 in. Guaranteed to seal any damaged threads ABS glass-reinforced plastic for added strength