Astro 16W 2D White/Prismatic IP65 Bulkhead Fitting 16W 2D Polycarbonate Wall/Ceiling Bulkhead Fitting AA16/WP/HF £0.00 Out of stock. Multi-purpose range of square bulkhead fittings for both internal and external installations. All polycarbonate construction with hinged gear tray. Body options of black or white with diffuser options of clear prismatic or opal. Supplied c/w lamp.