Replaces all instances of spawn() with addtimer/INVOKE_ASYNC

code/modules/recycling/disposal-structures.dm

@@ -555,9 +555,7 @@
 /obj/structure/disposalpipe/trunk/Initialize()
 	. = ..()
 	dpdir = dir
-	spawn(1)
-		getlinked()
-
+	getlinked()
 	update()
 
 /obj/structure/disposalpipe/trunk/Destroy()
@@ -658,12 +656,11 @@
 	else
 		stored = new (src, DISP_END_OUTLET,dir)
 
-	spawn(1)
-		target = get_ranged_target_turf(src, dir, 10)
+	target = get_ranged_target_turf(src, dir, 10)
 
-		trunk = locate() in src.loc
-		if(trunk)
-			trunk.linked = src	// link the pipe trunk to self
+	trunk = locate() in loc
+	if(trunk)
+		trunk.linked = src	// link the pipe trunk to self
 
 /obj/structure/disposaloutlet/Destroy()
 	if(trunk)

code/modules/recycling/disposal-unit.dm

@@ -379,6 +379,11 @@
 	else if(full_pressure)
 		add_overlay("dispover-ready")
 
+/obj/machinery/disposal/bin/proc/do_flush()
+	set waitfor = FALSE
+	SSblackbox.inc("disposal_auto_flush")
+	flush()
+
 //timed process
 //charge the gas reservoir and perform flush if ready
 /obj/machinery/disposal/bin/process()
@@ -389,15 +394,13 @@
 	if(flush_count >= flush_every_ticks)
 		if(contents.len)
 			if(full_pressure)
-				spawn(0)
-					SSblackbox.inc("disposal_auto_flush",1)
-					flush()
+				do_flush()
 		flush_count = 0
 
 	updateDialog()
 
 	if(flush && air_contents.return_pressure() >= SEND_PRESSURE) // flush can happen even without power
-		INVOKE_ASYNC(src, .proc/flush)
+		do_flush()
 
 	if(stat & NOPOWER) // won't charge if no power
 		return
@@ -447,10 +450,9 @@
 /obj/machinery/disposal/deliveryChute/Initialize(mapload, obj/structure/disposalconstruct/make_from)
 	. = ..()
 	stored.ptype = DISP_END_CHUTE
-	spawn(5)
-		trunk = locate() in loc
-		if(trunk)
-			trunk.linked = src	// link the pipe trunk to self
+	trunk = locate() in loc
+	if(trunk)
+		trunk.linked = src	// link the pipe trunk to self
 
 /obj/machinery/disposal/deliveryChute/place_item_in_disposal(obj/item/I, mob/user)
 	if(I.disposalEnterTry())