the steps stated above is thereafter delivered to the field and laid out along the row of trees to be irrigated after accomplishing this step the individual reference marks 143 are aligned with the respective trees thereby positioning each coupler apparatus 10 in the precise location earlier calculated for the sprinkler devices 114 following the alignment of the reference marks 143 the second conduit 100 would be sealably and slidably received in each of the channels 83 and would be urged through the water connection orifice 25 which has been formed in the side wall 21 of the first conduit 20 the sprinkler riser 110 would then be connected in fluid communication with the second conduit and the threaded neck portion 120 of the sprinkler device 114 would be screw threadably connected to the first end 111 of the sprinkler riser it should be understood that the second conduit 100 the sprinkler riser 110 and the sprinkler device 114 will normally be assembled into a single integral unit prior to delivery to the site where installation is taking place in this fashion installation can proceed expeditiously the final step of installation would include mounting the positioning member 124 to the first portion 30 of each coupler apparatus 10 and placing it an.