Ultraviolet lamp for use in water purifiers

A water purifier apparatus comprising:

• a hollow housing extending along a longitudinal axis, and having a hollow, sleeve mounted therein and bounding a flow-through passage, said housing having an inlet for admitting water to be purified into the passage and an outlet for discharging purified water from the passage;
• an elongated, hollow axially-extending arc tube mounted within the sleeve, said arc tube containing a gas;
• a pair of electrodes spaced apart along the longitudinal axis and respectively mounted within the arc tube at end regions thererof;
• a pair of end caps, respectively mounted at the end regions of the arc tube;
• a first pair of electrical pins electrically connected to one of the electrodes;
• a second pair of electrical pins, electrically connected to the other of the electrodes;
• and
• said pins being mounted on one of the end caps, and being offset relative to each other along the longitudinal axis, said one end cap including a mutually parallel distal semi-circular base and a proximal semi-circular base with a barrier wall extending between said distal and proximal bases, said barrier wall including either an extension extending outwardly therefrom along said proximal base or a recess extending inwardly therefrom along said distal base, said extension or said recess being coextensive with said distal and proximal bases, said first pair of pins extending through said distal base and said second pair of pins extending through said proximal base.