Philips 325126 9-watt PL-S TUV Germicidal with  2-Pin Base Light Bulb
Philips 9-watt PL-S TUV PL-S Compact Fluorescent Non-Integrated (CFL-ni) lamps are compact UVC (germicidal) lamps used in residential water and air disinfection units.  The compact size of the lamp allows for a small system design and design flexibility.  TUV PL-S lamps have a protective inside coating that ensures contact UV output over their complete lifetime for maximum security of disinfection and high system efficacy.  Thanks to the single-ended lamp base, lamp replacement is easy.