diff --git a/src/pocketmine/block/IronTrapdoor.php b/src/pocketmine/block/IronTrapdoor.php
index c2844d51b..abd90c5fa 100644
--- a/src/pocketmine/block/IronTrapdoor.php
+++ b/src/pocketmine/block/IronTrapdoor.php
@@ -21,20 +21,12 @@
 
 namespace pocketmine\block;
 
-use pocketmine\item\Item;
 use pocketmine\item\Tool;
-use pocketmine\math\AxisAlignedBB;
-use pocketmine\level\sound\DoorSound;
-use pocketmine\Player;
 
-class IronTrapdoor extends Transparent{
+class IronTrapdoor extends Trapdoor{
 
 	protected $id = self::IRON_TRAPDOOR;
 
-	public function __construct($meta = 0){
-		$this->meta = $meta;
-	}
-
 	public function getName(){
 		return "Iron Trapdoor";
 	}
@@ -43,114 +35,6 @@ class IronTrapdoor extends Transparent{
 		return 5;
 	}
 
-	public function canBeActivated(){
-		return true;
-	}
-
-	protected function recalculateBoundingBox(){
-
-		$damage = $this->getDamage();
-
-		$f = 0.1875;
-
-		if(($damage & 0x08) > 0){
-			$bb = new AxisAlignedBB(
-					$this->x,
-					$this->y + 1 - $f,
-					$this->z,
-					$this->x + 1,
-					$this->y + 1,
-					$this->z + 1
-			);
-		}else{
-			$bb = new AxisAlignedBB(
-					$this->x,
-					$this->y,
-					$this->z,
-					$this->x + 1,
-					$this->y + $f,
-					$this->z + 1
-			);
-		}
-
-		if(($damage & 0x04) > 0){
-			if(($damage & 0x03) === 0){
-				$bb->setBounds(
-						$this->x,
-						$this->y,
-						$this->z + 1 - $f,
-						$this->x + 1,
-						$this->y + 1,
-						$this->z + 1
-				);
-			}elseif(($damage & 0x03) === 1){
-				$bb->setBounds(
-						$this->x,
-						$this->y,
-						$this->z,
-						$this->x + 1,
-						$this->y + 1,
-						$this->z + $f
-				);
-			}
-			if(($damage & 0x03) === 2){
-				$bb->setBounds(
-						$this->x + 1 - $f,
-						$this->y,
-						$this->z,
-						$this->x + 1,
-						$this->y + 1,
-						$this->z + 1
-				);
-			}
-			if(($damage & 0x03) === 3){
-				$bb->setBounds(
-						$this->x,
-						$this->y,
-						$this->z,
-						$this->x + $f,
-						$this->y + 1,
-						$this->z + 1
-				);
-			}
-		}
-
-		return $bb;
-	}
-
-	public function place(Item $item, Block $block, Block $target, $face, $fx, $fy, $fz, Player $player = null){
-		if(($target->isTransparent() === false or $target->getId() === self::SLAB) and $face !== 0 and $face !== 1){
-			$faces = [
-					2 => 0,
-					3 => 1,
-					4 => 2,
-					5 => 3,
-			];
-			$this->meta = $faces[$face] & 0x03;
-			if($fy > 0.5){
-				$this->meta |= 0x08;
-			}
-			$this->getLevel()->setBlock($block, $this, true, true);
-
-			return true;
-		}
-
-		return false;
-	}
-
-	public function getDrops(Item $item){
-		return [
-				[$this->id, 0, 1],
-		];
-	}
-
-	public function onActivate(Item $item, Player $player = null){
-		$this->meta ^= 0x04;
-		$this->getLevel()->setBlock($this, $this, true);
-		$this->level->addSound(new DoorSound($this));
-		return true;
-	}
-
 	public function getToolType(){
 		return Tool::TYPE_PICKAXE;
 	}
diff --git a/src/pocketmine/block/Trapdoor.php b/src/pocketmine/block/Trapdoor.php
index 370cef37d..fffe8ee84 100644
--- a/src/pocketmine/block/Trapdoor.php
+++ b/src/pocketmine/block/Trapdoor.php
@@ -28,6 +28,13 @@ use pocketmine\level\sound\DoorSound;
 use pocketmine\Player;
 
 class Trapdoor extends Transparent{
+	const MASK_UPPER = 0x04;
+	const MASK_OPENED = 0x08;
+	const MASK_SIDE = 0x03;
+	const MASK_SIDE_SOUTH = 2;
+	const MASK_SIDE_NORTH = 3;
+	const MASK_SIDE_EAST = 0;
+	const MASK_SIDE_WEST = 1;
 
 	protected $id = self::TRAPDOOR;
 
@@ -53,7 +60,7 @@ class Trapdoor extends Transparent{
 
 		$f = 0.1875;
 
-		if(($damage & 0x08) > 0){
+		if(($damage & self::MASK_UPPER) > 0){
 			$bb = new AxisAlignedBB(
 				$this->x,
 				$this->y + 1 - $f,
@@ -73,8 +80,8 @@ class Trapdoor extends Transparent{
 			);
 		}
 
-		if(($damage & 0x04) > 0){
-			if(($damage & 0x03) === 0){
+		if(($damage & self::MASK_OPENED) > 0){
+			if(($damage & 0x03) === self::MASK_SIDE_NORTH){
 				$bb->setBounds(
 					$this->x,
 					$this->y,
@@ -83,7 +90,7 @@ class Trapdoor extends Transparent{
 					$this->y + 1,
 					$this->z + 1
 				);
-			}elseif(($damage & 0x03) === 1){
+			}elseif(($damage & 0x03) === self::MASK_SIDE_SOUTH){
 				$bb->setBounds(
 					$this->x,
 					$this->y,
@@ -93,7 +100,7 @@ class Trapdoor extends Transparent{
 					$this->z + $f
 				);
 			}
-			if(($damage & 0x03) === 2){
+			if(($damage & 0x03) === self::MASK_SIDE_WEST){
 				$bb->setBounds(
 					$this->x + 1 - $f,
 					$this->y,
@@ -103,7 +110,7 @@ class Trapdoor extends Transparent{
 					$this->z + 1
 				);
 			}
-			if(($damage & 0x03) === 3){
+			if(($damage & 0x03) === self::MASK_SIDE_EAST){
 				$bb->setBounds(
 					$this->x,
 					$this->y,
@@ -121,14 +128,15 @@ class Trapdoor extends Transparent{
 	public function place(Item $item, Block $block, Block $target, $face, $fx, $fy, $fz, Player $player = null){
 		if(($target->isTransparent() === false or $target->getId() === self::SLAB) and $face !== 0 and $face !== 1){
 			$faces = [
-				2 => 0,
-				3 => 1,
-				4 => 2,
-				5 => 3,
+				self::SIDE_SOUTH => self::MASK_SIDE_SOUTH,
+				self::SIDE_NORTH => self::MASK_SIDE_NORTH,
+				self::SIDE_EAST => self::MASK_SIDE_EAST,
+				self::SIDE_WEST => self::MASK_SIDE_WEST,
 			];
-			$this->meta = $faces[$face] & 0x03;
+			echo $face, PHP_EOL, $faces[$face], PHP_EOL;
+			$this->meta = $faces[$face] & self::MASK_SIDE;
 			if($fy > 0.5){
-				$this->meta |= 0x08;
+				$this->meta |= self::MASK_UPPER;
 			}
 			$this->getLevel()->setBlock($block, $this, true, true);
 
@@ -145,7 +153,7 @@ class Trapdoor extends Transparent{
 	}
 
 	public function onActivate(Item $item, Player $player = null){
-		$this->meta ^= 0x04;
+		$this->meta ^= self::MASK_OPENED;
 		$this->getLevel()->setBlock($this, $this, true);
 		$this->level->addSound(new DoorSound($this));
 		return true;