Check the listing for details. Aquasana AQ-UV-STD-LAMP Compatible Replacement Bulb for AQ-UV-STD & TD-UV-STD. Condition: New. Listed at 33.40 USD. Aquasana AQ-UV-STD-LAMP Compatible Replacement Bulb for AQ-UV-STD & TD-UV-STD (Made before July 2019)This is a Caprock brand lamp that is compatible with the Aquasana AQ-UV-STD-Lamp and other lamps selling at a much higher price. It is not made by Aquasana. The lamp has a special multi-step 4 pin base, designed specifically for pre-July 2019 UV systems by Aquasana. It measures about 307mm (about 12 inches), excluding the four pins on the end of the lamp. Its peak output is at 254nm. This lamp WILL NOT WORK in systems made after July 2019 which require an AQ-UV-L330C Lamp. These require a lamp with a different end fitting that has a recessed slot with two pins: https://www.ebay.com/itm/304578382120 Used in these and other systems:Aquasana AQ-UV-STDAquasana AQ-UV-STD-LAMPAquasana THD-UV-STDAquasana 300619430Aquasana 816749014518Aquasana SC-200Aquasana SC-200AAquasana SCM-200Aquasana SP-200 HOUS buyers get FREE SHIPPING to ANY point in the US. Foreign buyers please request shipping charges prior to bidding. Payment must be received within five days to avoid negative feedback.