The MP-1.5NPT-TA is a tube adapter that connects standard 1-1/2" sched-40 NPT pipes to channel strut. This adapter allows speakers and other objects to be mounted under channel strut using standard off the shelf 1-1/2" sched-40 NPT pipes. The MP-1.5NPT-TA is designed to hold overhead objects with a maximum weight of 220 lbs. Maximum length of 72” long pipe is recommended.