diff --git a/code/game/machinery/pipe/construction.dm b/code/game/machinery/pipe/construction.dm
index baa5b9f975..c08eb80a79 100644
--- a/code/game/machinery/pipe/construction.dm
+++ b/code/game/machinery/pipe/construction.dm
@@ -48,6 +48,8 @@ Buildable meters
 #define PIPE_SCRUBBERS_DOWN			40
 #define PIPE_SUPPLY_CAP				41
 #define PIPE_SCRUBBERS_CAP			42
+///// Mirrored T-valve ~ because I couldn't be bothered re-sorting all of the defines
+#define PIPE_MTVALVEM				43
 
 /obj/item/pipe
 	name = "pipe"
@@ -130,6 +132,8 @@ Buildable meters
 			src.pipe_type = PIPE_PASSIVE_GATE
 		else if(istype(make_from, /obj/machinery/atmospherics/unary/heat_exchanger))
 			src.pipe_type = PIPE_HEAT_EXCHANGE
+		else if(istype(make_from, /obj/machinery/atmospherics/tvalve/mirrored))
+			src.pipe_type = PIPE_MTVALVEM
 		else if(istype(make_from, /obj/machinery/atmospherics/tvalve))
 			src.pipe_type = PIPE_MTVALVE
 		else if(istype(make_from, /obj/machinery/atmospherics/pipe/manifold4w/visible/supply) || istype(make_from, /obj/machinery/atmospherics/pipe/manifold4w/hidden/supply))
@@ -244,6 +248,7 @@ Buildable meters
 		"scrubbers pipe down", \
 		"supply pipe cap", \
 		"scrubbers pipe cap", \
+		"t-valve m", \
 	)
 	name = nlist[pipe_type+1] + " fitting"
 	var/list/islist = list( \
@@ -293,6 +298,7 @@ Buildable meters
 		"cap", \
 		"cap", \
 		"cap", \
+		"mtvalvem", \
 	)
 	icon_state = islist[pipe_type + 1]
 
@@ -369,9 +375,9 @@ Buildable meters
 			return dir|flip|cw|acw
 		if(PIPE_MANIFOLD, PIPE_SUPPLY_MANIFOLD, PIPE_SCRUBBERS_MANIFOLD)
 			return flip|cw|acw
-		if(PIPE_GAS_FILTER, PIPE_GAS_MIXER,PIPE_MTVALVE)
+		if(PIPE_GAS_FILTER, PIPE_GAS_MIXER, PIPE_MTVALVE)
 			return dir|flip|cw
-		if(PIPE_GAS_FILTER_M, PIPE_GAS_MIXER_M)
+		if(PIPE_GAS_FILTER_M, PIPE_GAS_MIXER_M, PIPE_MTVALVEM)
 			return dir|flip|acw
 		if(PIPE_GAS_MIXER_T)
 			return dir|cw|acw
@@ -925,6 +931,26 @@ Buildable meters
 				V.node3.initialize()
 				V.node3.build_network()
 
+		if(PIPE_MTVALVEM)		//manual t-valve
+			var/obj/machinery/atmospherics/tvalve/mirrored/V = new(src.loc)
+			V.set_dir(dir)
+			V.initialize_directions = pipe_dir
+			if (pipename)
+				V.name = pipename
+			var/turf/T = V.loc
+			V.level = T.intact ? 2 : 1
+			V.initialize()
+			V.build_network()
+			if (V.node1)
+				V.node1.initialize()
+				V.node1.build_network()
+			if (V.node2)
+				V.node2.initialize()
+				V.node2.build_network()
+			if (V.node3)
+				V.node3.initialize()
+				V.node3.build_network()
+
 		if(PIPE_CAP)
 			var/obj/machinery/atmospherics/pipe/cap/C = new(src.loc)
 			C.set_dir(dir)
@@ -1168,6 +1194,7 @@ Buildable meters
 #undef PIPE_VOLUME_PUMP
 #undef PIPE_OUTLET_INJECT
 #undef PIPE_MTVALVE
+#undef PIPE_MTVALVEM
 #undef PIPE_GAS_FILTER_M
 #undef PIPE_GAS_MIXER_T
 #undef PIPE_GAS_MIXER_M
diff --git a/code/game/machinery/pipe/pipe_dispenser.dm b/code/game/machinery/pipe/pipe_dispenser.dm
index 49f566af57..fb296d2409 100644
--- a/code/game/machinery/pipe/pipe_dispenser.dm
+++ b/code/game/machinery/pipe/pipe_dispenser.dm
@@ -20,6 +20,7 @@
 <A href='?src=\ref[src];make=20;dir=1'>Pipe Cap</A><BR>
 <A href='?src=\ref[src];make=19;dir=1'>4-Way Manifold</A><BR>
 <A href='?src=\ref[src];make=18;dir=1'>Manual T-Valve</A><BR>
+<A href='?src=\ref[src];make=43;dir=1'>Manual T-Valve - Mirrored</A><BR>
 <A href='?src=\ref[src];make=21;dir=1'>Upward Pipe</A><BR>
 <A href='?src=\ref[src];make=22;dir=1'>Downward Pipe</A><BR>
 <b>Supply pipes:</b><BR>
@@ -48,10 +49,10 @@
 <A href='?src=\ref[src];make=10;dir=1'>Scrubber</A><BR>
 <A href='?src=\ref[src];makemeter=1'>Meter</A><BR>
 <A href='?src=\ref[src];make=13;dir=1'>Gas Filter</A><BR>
-<A href='?src=\ref[src];make=23;dir=1'>Gas Filter-Mirrored</A><BR>
+<A href='?src=\ref[src];make=23;dir=1'>Gas Filter - Mirrored</A><BR>
 <A href='?src=\ref[src];make=14;dir=1'>Gas Mixer</A><BR>
-<A href='?src=\ref[src];make=25;dir=1'>Gas Mixer-Mirrored</A><BR>
-<A href='?src=\ref[src];make=24;dir=1'>Gas Mixer-T</A><BR>
+<A href='?src=\ref[src];make=25;dir=1'>Gas Mixer - Mirrored</A><BR>
+<A href='?src=\ref[src];make=24;dir=1'>Gas Mixer - T</A><BR>
 <A href='?src=\ref[src];make=26;dir=1'>Omni Gas Mixer</A><BR>
 <A href='?src=\ref[src];make=27;dir=1'>Omni Gas Filter</A><BR>
 <b>Heat exchange:</b><BR>
diff --git a/icons/obj/pipe-item.dmi b/icons/obj/pipe-item.dmi
index 2fa39fec04..1ad833316d 100644
Binary files a/icons/obj/pipe-item.dmi and b/icons/obj/pipe-item.dmi differ