Viqua 602805 Replacement Lamp for Models C, C4, D/Plus, D4/Plus, IHS12-d4 4 pin style lamp Includes 2 new O-rings Fits Pelican Water UV systems only Long lasting, only replace once a year Low pressure high output lamp with a black base Fits Viqua models C, C4, D, D Plus, D4, D4 Plus, IHS12-D4 9000 hour (1-year) lamp life Genuine Viqua Replacement Product