Used on earlier B2700, B2900, and B2900F lifts. If carriage is louvered, lift uses four of this block and four of the 4B31023 blocks per side. If carriage is not louvered, it uses eight of the 4B31023 blocks per side.
How to tell which carriage you have:
Non-louvered carriages have lock dog 4B37081. Louvered carriages use lock dogs with spade bolt 4B37010 attached. If you are unsure of what you need, call us at 800-822-6720 and we will be happy to help.