diff --git a/code/__HELPERS/unsorted.dm b/code/__HELPERS/unsorted.dm
index 163ff45a635..fa3244f4b4f 100644
--- a/code/__HELPERS/unsorted.dm
+++ b/code/__HELPERS/unsorted.dm
@@ -613,12 +613,22 @@ Turf and target are seperate in case you want to teleport some distance from a t
 	return 1
 
 /proc/is_blocked_turf(turf/T)
-	var/cant_pass = 0
-	if(T.density) cant_pass = 1
-	for(var/atom/A in T)
-		if(A.density)//&&A.anchored
-			cant_pass = 1
-	return cant_pass
+	if(T.density)
+		return 1
+	for(var/i in T)
+		var/atom/A = i
+		if(A.density)
+			return 1
+	return 0
+
+/proc/is_anchored_dense_turf(turf/T) //like the older version of the above, fails only if also anchored
+	if(T.density)
+		return 1
+	for(var/i in T)
+		var/atom/movable/A = i
+		if(A.density && A.anchored)
+			return 1
+	return 0
 
 /proc/get_step_towards2(atom/ref , atom/trg)
 	var/base_dir = get_dir(ref, get_step_towards(ref,trg))
diff --git a/code/game/objects/items/weapons/RPD.dm b/code/game/objects/items/weapons/RPD.dm
index 320adf21ed8..18a49025893 100644
--- a/code/game/objects/items/weapons/RPD.dm
+++ b/code/game/objects/items/weapons/RPD.dm
@@ -529,7 +529,7 @@ var/global/list/RPD_recipes=list(
 
 	if(istype(A,/area/shuttle)||istype(A,/turf/space/transit))
 		return 0
-
+	
 	//So that changing the menu settings doesn't affect the pipes already being built.
 	var/queued_p_type = p_type
 	var/queued_p_dir = p_dir
@@ -592,7 +592,7 @@ var/global/list/RPD_recipes=list(
 			return 0
 
 		if(DISPOSALS_MODE)
-			if(!(istype(A, /turf)))
+			if(!isturf(A) || is_anchored_dense_turf(A))
 				user << "<span class='warning'>The [src]'s error light flickers!</span>"
 				return 0
 			user << "<span class='notice'>You start building pipes...</span>"
diff --git a/code/modules/recycling/disposal-construction.dm b/code/modules/recycling/disposal-construction.dm
index b1227bb5b80..d01854ccbb9 100644
--- a/code/modules/recycling/disposal-construction.dm
+++ b/code/modules/recycling/disposal-construction.dm
@@ -24,8 +24,6 @@
 	..(loc)
 	if(pipe_type)
 		ptype = pipe_type
-		if(!is_pipe())    // bins/chutes/outlets are dense
-			density = 1
 	dir = direction
 
 // update iconstate and dpdir due to dir and type
@@ -199,9 +197,7 @@
 			anchored = 0
 			if(ispipe)
 				level = 2
-				density = 0
-			else
-				density = 1
+			density = 0
 			user << "<span class='notice'>You detach the [nicetype] from the underfloor.</span>"
 		else
 			if(!is_pipe()) // Disposal or outlet
@@ -224,9 +220,7 @@
 			anchored = 1
 			if(ispipe)
 				level = 1 // We don't want disposal bins to disappear under the floors
-				density = 0
-			else
-				density = 1 // We don't want disposal bins or outlets to go density 0
+			density = 0
 			user << "<span class='notice'>You attach the [nicetype] to the underfloor.</span>"
 		playsound(loc, 'sound/items/Ratchet.ogg', 100, 1)
 		update()
diff --git a/code/modules/recycling/disposal-structures.dm b/code/modules/recycling/disposal-structures.dm
index d818c88567c..dc7413383cf 100644
--- a/code/modules/recycling/disposal-structures.dm
+++ b/code/modules/recycling/disposal-structures.dm
@@ -211,6 +211,9 @@
 //
 /obj/structure/disposalpipe/proc/transfer(obj/structure/disposalholder/H)
 	var/nextdir = nextdir(H.dir)
+	transfer_to_dir(H, nextdir)
+
+/obj/structure/disposalpipe/proc/transfer_to_dir(obj/structure/disposalholder/H, nextdir)
 	H.dir = nextdir
 	var/turf/T = H.nextloc()
 	var/obj/structure/disposalpipe/P = H.findpipe(T)
@@ -222,13 +225,11 @@
 			H.merge(H2)
 
 		H.loc = P
-	else			// if wasn't a pipe, then set loc to turf
-		H.loc = T
+		return P
+	else			// if wasn't a pipe, then they're now in our turf
+		H.loc = get_turf(src)
 		return null
 
-	return P
-
-
 // update the icon_state to reflect hidden status
 /obj/structure/disposalpipe/proc/update()
 	var/turf/T = src.loc
@@ -533,23 +534,7 @@
 
 /obj/structure/disposalpipe/sortjunction/transfer(obj/structure/disposalholder/H)
 	var/nextdir = nextdir(H.dir, H.destinationTag)
-	H.dir = nextdir
-	var/turf/T = H.nextloc()
-	var/obj/structure/disposalpipe/P = H.findpipe(T)
-
-	if(P)
-		// find other holder in next loc, if inactive merge it with current
-		var/obj/structure/disposalholder/H2 = locate() in P
-		if(H2 && !H2.active)
-			H.merge(H2)
-
-		H.loc = P
-	else			// if wasn't a pipe, then set loc to turf
-		H.loc = T
-		return null
-
-	return P
-
+	transfer_to_dir(H, nextdir)
 
 //a three-way junction that sorts objects destined for the mail office mail table (tomail = 1)
 /obj/structure/disposalpipe/wrapsortjunction
@@ -594,26 +579,7 @@
 
 /obj/structure/disposalpipe/wrapsortjunction/transfer(obj/structure/disposalholder/H)
 	var/nextdir = nextdir(H.dir, H.tomail)
-	H.dir = nextdir
-	var/turf/T = H.nextloc()
-	var/obj/structure/disposalpipe/P = H.findpipe(T)
-
-	if(P)
-		// find other holder in next loc, if inactive merge it with current
-		var/obj/structure/disposalholder/H2 = locate() in P
-		if(H2 && !H2.active)
-			H.merge(H2)
-
-		H.loc = P
-	else			// if wasn't a pipe, then set loc to turf
-		H.loc = T
-		return null
-
-	return P
-
-
-
-
+	transfer_to_dir(H, nextdir)
 
 //a trunk joining to a disposal bin or outlet on the same turf
 /obj/structure/disposalpipe/trunk
@@ -701,7 +667,6 @@
 	// transfer to linked object (outlet or bin)
 
 /obj/structure/disposalpipe/trunk/transfer(obj/structure/disposalholder/H)
-
 	if(H.dir == DOWN)		// we just entered from a disposer
 		return ..()		// so do base transfer proc
 	// otherwise, go to the linked object
@@ -715,11 +680,9 @@
 				D.expel(H)	// expel at disposal
 	else
 		if(H)
-			src.expel(H, src.loc, 0)	// expel at turf
+			src.expel(H, get_turf(src), 0)	// expel at turf
 	return null
 
-	// nextdir
-
 /obj/structure/disposalpipe/trunk/nextdir(fromdir)
 	if(fromdir == DOWN)
 		return dir