Blind plug SKINDICHT® BL-M heX. 40X1.5 +O-RING, Blind plug, Thread size: M 40, Nickel-plated brass, Halogen-free, UV-resistant, , Areas of application: Withstands high chemical and mechanical stress, Suitable for outdoor use, For closing an unused metric threaded hole on the housing, Benefits: Mounted O-ring enables the threaded/through hole to be sealed liquid-tight and thus a higher protection class (up to IP 68), Article numbers ending in 'LF' are lead-free product alternatives with otherwise identical product properties. 'Lead-free' articles do not contain lead, which is currently permitted to make up up to four percent in copper alloys, but could be banned in the future according to the RoHS directive, Withstands temperatures up to +100 °C, Easy to install using an open-end wrench