Obsolete the PROXMOVE flag and uses

code/game/objects/effects/alien/aliens.dm

@@ -441,7 +441,6 @@
 
 	var/health = 100
 	var/status = BURST //can be GROWING, GROWN or BURST; all mutually exclusive
-	flags = PROXMOVE
 
 /obj/effect/alien/egg/New()
 /*
@@ -545,16 +544,4 @@
 /obj/effect/alien/egg/fire_act(datum/gas_mixture/air, exposed_temperature, exposed_volume)
 	if(exposed_temperature > 500 + T0C)
 		health -= 5
-		healthcheck()
-/*
-/obj/effect/alien/egg/HasProximity(atom/movable/AM as mob|obj)
-	if(status == GROWN)
-		if(!CanHug(AM))
-			return
-
-		var/mob/living/carbon/C = AM
-		if(C.stat == CONSCIOUS && C.status_flags & XENO_HOST)
-			return
-
-		Burst(0)
-*/
+		healthcheck()

code/game/objects/items/devices/transfer_valve.dm

@@ -9,7 +9,6 @@
 	var/mob/attacher = null
 	var/valve_open = 0
 	var/toggle = 1
-	flags = PROXMOVE
 
 /obj/item/device/transfer_valve/attackby(obj/item/item, mob/user)
 	var/turf/location = get_turf(src) // For admin logs
@@ -57,11 +56,15 @@
 	return
 
 
-/obj/item/device/transfer_valve/HasProximity(atom/movable/AM as mob|obj)
-	if(!attached_device)	return
-	attached_device.HasProximity(AM)
-	return
+/obj/item/device/transfer_valve/HasProximity(turf/T, atom/movable/AM, old_loc)
+	attached_device?.HasProximity(T, AM, old_loc)
 
+/obj/item/device/transfer_valve/Moved(old_loc, direction, forced)
+	. = ..()
+	if(isturf(old_loc))
+		unsense_proximity(callback = .HasProximity, center = old_loc)
+	if(isturf(loc))
+		sense_proximity(callback = .HasProximity)
 
 /obj/item/device/transfer_valve/attack_self(mob/user as mob)
 	ui_interact(user)

code/game/objects/items/weapons/tanks/tanks.dm

@@ -678,6 +678,11 @@ var/list/global/tank_gauge_cache = list()
 		tank.update_icon()
 		tank.overlays -= "bomb_assembly"
 
-/obj/item/device/tankassemblyproxy/HasProximity(atom/movable/AM as mob|obj)
-	if(src.assembly)
-		src.assembly.HasProximity(AM)
+/obj/item/device/tankassemblyproxy/HasProximity(turf/T, atom/movable/AM, old_loc)
+	assembly?.HasProximity(T, AM, old_loc)
+
+/obj/item/device/tankassemblyproxy/Moved(old_loc, direction, forced)
+	if(isturf(old_loc))
+		unsense_proximity(callback = .HasProximity, center = old_loc)
+	if(isturf(loc))
+		sense_proximity(callback = .HasProximity)