A reverse lay is done when the engine supplying the apparatus at scene gets to them prior to finding a hydrant. In this case, the hydrant they will use is located beyond the apparatus at scene.
So when the air brake sets, both FFs perform exit procedures and exit the apparatus. The #4 firefighter will secure an SCBA and the irons and put them both underneath the other rig’s tailboard.
While this is happening, #3 will exit the apparatus and secure a 4” double male and their SCBA.
After #4 is done placing the equipment under the other rig, they’ll climb their own tailboard and pull out 4” hose. They will need enough 4” to reach the other rig’s rear 4” intake.
#4 will create three folds approximately 3’ long and then break the 4” increaser off. At this point, #3 can take over the 4” line and advise #4 to return to the rig. #4 returns the increaser back to the engineer’s compartment on their rig prior to getting in.
#3 checks for a gasket on the 4” female coupling and then connects the 4” double male. They then kneel on the folded hose, lift the coupling up and advise
their engineer to “take it away”.
#3 will get off the hose when they hear the air brake set, when the first coupling drops out of the hose bed or if there’s a catastrophic failure. From here they’ll bring the hoseline with the 4” double male attached and make their connection at the other apparatus’ rear 4” intake.
They will check for a gasket prior to making the connection and then use some slack in the line to push into the connection with their shoulder to tighten the connection down even further. Finally, they flake out the hose and give a turnover to the engineer.