3M PPS Midi Collars are hard twist-on collars that complete the connection between Midi-sized Cups, Lids and Liners used in the PPS Paint Preparation System. These Collars are sized for 400 ml (13.5 oz.) Midi PPS Cups. They are also available as PPS Cups & Collars sets. 3M PPS is a complete painting system that allows the painter to measure, mix, filter, and spray paint materials.Use 3M PPS Midi Collars as replacment parts for the 3M PPS Spray Cup System Midi. These Midi 400 ml (13.5 oz.)-sized 3M PPS Collars twist on to allow a tight seal between PPS Cups and PPS Lids for optimized spray performance. They also help support disposable 3M PPS Liners, reducing accidental leakage into reusable cups. These 3M PPS Collars are available in bulk (75 Collars per box). They are also part of the corresponding Midi-sized 3M PPS Cups.