A lubricant dispenser comprising: a housing; a reservoir for containing lubricant; a pump assembly operable to pump lubricant; and a purge assembly characterized in that the purge assembly includes a channel defined by the housing and extending between the reservoir and atmosphere, the channel including a first portion opening to the reservoir and a second portion, the second portion extending perpendicularly from the first portion along a channel axis through an opening (66, 220') in the housing and to atmosphere, and a plunger (240', 78) including an elongated stem positioned within the first portion of the channel, the plunger slidable along a plunger axis between a sealed position, in which the reservoir is isolated from atmosphere, and an open position, in which the reservoir is in fluid communication with atmosphere, the plunger axis extending at an angle with respect to the channel axis, the elongated stem having a diameter that is less than a diameter of the second portion of the channel, wherein lubricant flows through the first portion of the channel and over the elongated stem to the second portion of the channel; wherein the plunger (78, 240') defines an aperture (94, 276'), in the sealed position, the aperture (94, 276') not being aligned with the channel, and, in the open position, at least a portion of the aperture (94, 276') being aligned with the channel, such that lubricant emerges through the channel to atmosphere. a housing; a reservoir for containing lubricant; a pump assembly operable to pump lubricant; and a purge assembly characterized in that the purge assembly includes a channel defined by the housing and extending between the reservoir and atmosphere, the channel including a first portion opening to the reservoir and a second portion, the second portion extending perpendicularly from the first portion along a channel axis through an opening (66, 220') in the housing and to atmosphere, and a plunger (240', 78) including an elongated stem positioned within the first portion of the channel, the plunger slidable along a plunger axis between a sealed position, in which the reservoir is isolated from atmosphere, and an open position, in which the reservoir is in fluid communication with atmosphere, the plunger axis extending at an angle with respect to the channel axis, the elongated stem having a diameter that is less than a diameter of the second portion of the channel, wherein lubricant flows through the first portion of the channel and over the elongated stem to the second portion of the channel; a channel defined by the housing and extending between the reservoir and atmosphere, the channel including a first portion opening to the reservoir and a second portion, the second portion extending perpendicularly from the first portion along a channel axis through an opening (66, 220') in the housing and to atmosphere, and a plunger (240', 78) including an elongated stem positioned within the first portion of the channel, the plunger slidable along a plunger axis between a sealed position, in which the reservoir is isolated from atmosphere, and an open position, in which the reservoir is in fluid communication with atmosphere, the plunger axis extending at an angle with respect to the channel axis, the elongated stem having a diameter that is less than a diameter of the second portion of the channel, wherein lubricant flows through the first portion of the channel and over the elongated stem to the second portion of the channel; wherein the plunger (78, 240') defines an aperture (94, 276'), in the sealed position, the aperture (94, 276') not being aligned with the channel, and, in the open position, at least a portion of the aperture (94, 276') being aligned with the channel, such that lubricant emerges through the channel to atmosphere.