UV sterilizer bulb question?

[eleyan]

I have the 9W Turbo-Twist UV sterilizer:
http://www.drsfostersmith.com/produc...2004&Nty=1

I was looking for a replacement bulb and noticed that the price for the 9W bulb for the Turbo-Twist is more than the bulb for the Custom sea life Double-Helix ($24.99 vs $31.99):
http://www.drsfostersmith.com/produc...2004&Nty=1

I used to have the double helix and remember that the bulb looks the same. Any one knows if they are interchangable? or does anyone have a double helix I can compare my bulb to?

[kaiser]

try this one http://cgi.ebay.com/ws/eBayISAPI.dll...44589&rd=1