In Tremors 3: Back to Perfection (2001), Nancy sells the Assblaster to Siegfried and Roy. In this episode, they are called Sigmund and Ray.
Despite airing 4th, this is the 3rd episode in the timeline of the series.
When Rosalita is being chased by the Assblaster, she grabs a small tube off of a wind chime to use to breathe through when she jumps in the water tank. When she sits up after the Assblaster leaves, there is now a rubber mouthpiece on the end of the tube she had in her mouth.
When Burt spots the Assblaster through his night vision goggles, the animatronic creature's foot can easily be seen dangling in the air, revealing that the creature is being held by puppeteers instead of standing on the ground.