The 87133-6 is a single-row, 20-position receptacle housing assembly with right end open configuration, part of the AMPMODU Mod IV interconnection system. It features a 0.100 inch (2.54 mm) centerline spacing with dual entry, low-profile design and end-to-end stackable capability. The housing is constructed from glass-filled thermoplastic material rated 94V-0, with duplex gold and matte tin plating on contact areas and nickel underplating for enhanced durability and electrical performance. The assembly accommodates crimp snap-in receptacles and supports standard pressure contacts, making it suitable for applications requiring reliable multi-position interconnections in compact spaces. This stamped housing variant is commonly used in telecommunications, industrial control systems, and consumer electronics where space efficiency and stackability are important design considerations.