anchor.diff:  				return
   
   			// otherwise, do normal expel from turf
  -			expel(H, T, 0)
  +			if(H)
  +				expel(H, T, 0)
   		..()
   
   	// returns the direction of the next pipe object, given the entrance dir
  
positive.code: 		// otherwise, go to the linked object
  		if(linked)
  			var/obj/structure/disposaloutlet/O = linked
  			if(istype(O))
  				O.expel(H)	// expel at outlet
  			else
  				var/obj/machinery/disposal/D = linked
  				D.expel(H)	// expel at disposal
  		else
  			src.expel(H, src.loc, 0)	// expel at turf
  		return null
  
  	// nextdir
  
negative.code: 				return
  
  			// otherwise, do normal expel from turf
  			if(H)
  				expel(H, T, 0)
  
  		spawn(2)	// delete pipe after 2 ticks to ensure expel proc finished
  			del(src)
  