3M PPS Adapter Type 21 26105 for sale online | eBay
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3M™ PPS™ Series 2.0 Adapter | 3M United States
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3M™ PPS™ Series 2.0 Adapter Type S5 | SprayGunner
These are 3M PPS 2.0 adapters for paint guns. Without knowing the thread diameter and pitch, it's not possible to identify exactly. Obtain those measurements and refer to the chart on the