This is a Hayward Replacement (1991 PRIOR) Drain Plug for Super II SP3000/SP3000X, Super Pump SP1600X/SP2600X, MaxFlo SP1800X/SP2800X Pump Series. Fits Hayward Superpump SP1600x series models SP1600x5, SP1605x7, SP1607x10, SP1608x10, SP1610x15, SP1611x15, SP1615x20, SP1616x20, SP1621x25