Scale: 1/23
 
Set includes 4 breech doors (2 port and 2 starboard).
 
Dimensions:
Inner diameter of cylinder = 22 mm.
Outer diameter of cylinder (not including flanges or other details) = 25.24 mm.  If the outer diameter of your PT Boat model kit's torpedo tubes is slightly smaller than 25.24 mm, these 3D-printed parts will match your kit's torpedo tube parts well.
 
This set of four models represents the doors on the aft end of Mk.18 Torpedo Tubes mounted to many World War Two US Navy PT Boats such as the famous PT-109 commanded by then-Lieutenant John F. Kennedy.  The Mk.18 Torpedo Tube was used early in the war until replaced by roll-off racks for aircraft-type Mk.13 torpedoes.  
 
A good reference for PT boats can be found on NavSource (click here).

These model breech doors are not 3D-printed copies of any plastic model kit's parts.  They are designed from actual builder’s blueprints.  Therefore, they may not be the same size or shape of your plastic kit's parts.  Some adjustment of the plastic kit's parts may be needed for best fit.

Features:
accurately scaled from scans of original Electric Boat Company manufacturer's blueprints dated 3 December 1942
details confirmed from careful study of period photographs
hinges properly positioned for port tubes and the starboard tubes (hinges go on the inboard side of the door) 
accurate, detailed, tube-top firing combustion chamber
accurate breech door hinge
exterior stiffener rings properly sized and located
bolt heads accurately scaled in their proper position, randomly turned for realism
 
© Model Monkey LLC.  This 3D-printed item may not be copied or recast.