diff --git a/core/apis/itemDB.lua b/core/apis/itemDB.lua
index ab014e9..21d0442 100644
--- a/core/apis/itemDB.lua
+++ b/core/apis/itemDB.lua
@@ -52,6 +52,7 @@ function itemDB:splitKey(key, item)
 end
 
 function itemDB:get(key)
+  if not key then error('itemDB:get: key is required', 2) end
   if type(key) == 'string' then
     key = self:splitKey(key)
   end
diff --git a/milo/apis/storage.lua b/milo/apis/storage.lua
index a18297f..021e3b6 100644
--- a/milo/apis/storage.lua
+++ b/milo/apis/storage.lua
@@ -293,6 +293,19 @@ function Storage:export(target, slot, count, item)
   return total
 end
 
+local function isLockedWith(node, key)
+  if node.lock then
+    if type(node.lock) == 'string' then
+      return node.lock == key
+    end
+    for k in pairs(node.lock) do
+      if k == key then
+        return true
+      end
+    end
+  end
+end
+
 function Storage:import(source, slot, count, item)
   local total = 0
   local key = item.key or table.concat({ item.name, item.damage, item.nbtHash }, ':')
@@ -320,23 +333,27 @@ _G._debug('INS: %s(%d): %s[%d] -> %s',
   end
 
   -- find a chest locked with this item
-  for remote in self:onlineAdapters() do
-    if remote.lock == key then
-      insert(remote.adapter)
-      if count > 0 then -- TODO: only if void flag set
+  for node in self:onlineAdapters() do
+    if isLockedWith(node, key) then
+      insert(node.adapter)
+      if count > 0 and node.void then
         total = total + self:trash(source, slot, count)
+        return total
       end
+      --return total
+    end
+    if count <= 0 then
       return total
     end
   end
 
   -- is this item in some chest
   if self.cache[key] then
-    for _, adapter in self:onlineAdapters() do
+    for node, adapter in self:onlineAdapters() do
       if count <= 0 then
         return total
       end
-      if adapter.cache and adapter.cache[key] and not adapter.lock then
+      if adapter.cache and adapter.cache[key] and not node.lock then
         insert(adapter)
       end
     end
diff --git a/milo/plugins/storageView.lua b/milo/plugins/storageView.lua
index b850510..e11a07a 100644
--- a/milo/plugins/storageView.lua
+++ b/milo/plugins/storageView.lua
@@ -20,21 +20,25 @@ local storageView = UI.Window {
 		},
 		[2] = UI.Checkbox {
 			formLabel = 'Locked', formKey = 'lockWith',
-			help = 'Locks chest to a single item type',
+			help = 'Locks chest to current item types',
 		},
 		[3] = UI.Text {
 			x = 16, ex = -2, y = 3,
 			value = '',
 		},
-		[4] = UI.TextEntry {
+		[4] = UI.Checkbox {
+			formLabel = 'Void', formKey = 'void',
+			help = 'Void items if locked chest is full',
+		},
+		[5] = UI.TextEntry {
 			formLabel = 'Refresh', formKey = 'refreshInterval',
-			help = 'Refresh periodically',
+			shadowText = 'seconds between refresh',
 			limit = 4,
 			validate = 'numeric',
-			shadowText = 'seconds between refresh',
+			help = 'Refresh periodically',
 		},
-		[5] = UI.TextArea {
-			x = 12, ex = -2, y = 5,
+		[6] = UI.TextArea {
+			x = 12, ex = -2, y = 6,
 			textColor = colors.yellow,
 			value = 'Only specify if you are manually taking items out of this inventory. Value should be > 10',
 		},
@@ -53,9 +57,24 @@ local storageView = UI.Window {
 	},
 }
 
+function storageView:showLockTypes()
+	local types = { }
+	if self.node.lock then
+		if type(self.node.lock) == 'string' then
+			self.form[3].value = self.node.lock
+			return
+		end
+		for name in pairs(self.node.lock) do
+			table.insert(types, itemDB:getName(name))
+		end
+	end
+	self.form[3].value = table.concat(types, ', ')
+end
+
 function storageView:enable()
 	UI.Window.enable(self)
 	self:focusFirst()
+	self:showLockTypes()
 end
 
 function storageView:validate()
@@ -76,32 +95,34 @@ function storageView:isValidFor(node)
 end
 
 function storageView:setNode(node)
-	self.machine = node
+	self.node = node
 	self.form:setValues(node)
-	self.form[3].value = node.lock and itemDB:getName(node.lock) or ''
+	self:showLockTypes()
 end
 
 function storageView:eventHandler(event)
 	if event.type == 'checkbox_change' and event.element.formKey == 'lockWith' then
 		if event.checked then
-			if device[self.machine.name] and device[self.machine.name].list then
-				local _, slot = next(device[self.machine.name].list())
-				if slot then
-					self.machine.lock = itemDB:makeKey(slot)
-					self.form[3].value = itemDB:getName(slot)
-				else
+			if device[self.node.name] and device[self.node.name].list then
+				local lock = { }
+				for _, slot in pairs(device[self.node.name].list()) do
+					lock[itemDB:makeKey(slot)] = true
+				end
+				if not next(lock) then
 					self:emit({
 						type = 'general_error',
 						field = event.element,
-						message = 'The chest must contain the item to lock' })
+						message = 'The chest must contain the item(s) to lock' })
 					self.form[3].value = false
-					self.form[3]:draw()
+				else
+					self.node.lock = lock
 				end
 			end
 		else
-			self.machine.lock = nil
+			self.node.lock = nil
 			self.form[3].value = ''
 		end
+		self:showLockTypes()
 		self.form[3]:draw()
 	end
 end