An adjustable coupler is disclosed for interconnecting leaching chambers to create a serpentine pathway for a leaching field. A coupler can connect a first leaching chamber and a second leaching chamber. The coupler can comprise a mating feature and an adjustment feature. The mating feature can be used to mate the coupler between the first leaching chamber and the second leaching chamber. The mating feature can include a swivel connector matable to an end of one of the chambers. The adjustment feature can adjust the angle between the first chamber and the second chamber between a range of angles. The adjustment feature can include a swivel connector. The range of angles can be particularly chosen to be about 45.degree.. More particularly, the range of angles can be about 22.5.degree. in either the clockwise or counter-clockwise direction.