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Investor Presentaiton

Permian to USGC: Wink to Webster Wink Wink to Webster Permian JV Gathering (other Plains assets in grey) Midland Houston Area wink to webster Current Status PIPELINE Midland-to-Webster - interim service Jan-2021 MVCs ramping from 1Q22 through 2023 ■ Deferred portion of investment to align w/ MVC ramp Project Overview ■ ~1.5 mmb/d capacity (36" diameter) ■ Highly contracted, long-term MVCS Origins: Wink & Midland ■ Destinations: ECHO, Webster, Baytown, TX City ■ W2W JV ownership: 71% of capacity ■ PAA: 16% of W2W JV ownership ■ Other JV partners: XOM, Lotus, MPLX, DK, RTLR UJI w/ EPD: 29%, Midland-to-Webster segment 38

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