This is a Zodiac Old Style Mechanical Shaft Seal replacement for Jandy Stealth SHPF/SHPM Pumps and Polaris PB4-60 Booster Pumps.
This pump shaft seal is identical to these replacement parts: Advance 6C201, American 395005, Baker Hydro 385920, 35B1109, Harmsco 201, Hayward SPX1600Z2, Jacuzzi 100477, 100486, 100487, 10150209, Marlow 38592, Martec 320119, PacFab 350002, 354001, 354894, Premier 31812, Purex P28300, 071278, Sta-Rite 173510101, U9358, U109358SS, U109372SS, 374000027S, Swimquip 374070009, Wayne Water 15693.
