Whaler Restoration – Hull Id Plate & Drain Tube Installation

In addition to Boston Whalers’ own stenciling system on the inside of the transom, the FBSA (Federal Boating Safety Act) of 1971 introduced regulations stating that boat manufacturers were required to affix Hull Identification Numbers to each boat produced. BW chose to put this metal plate on the outboard side of the transom, starboard side, within 2 inches of the gunwale. Well, the original metal id plate on this hull was corroded and not even readable, so I was able to order a replacement HID plate from the same company who produced my graphics, Magic Brush. The original plate was installed with rivets, but I opted to use some 3M 4200 marine adhesive/sealant and screws for the installation.

My Hull Id Number is: BWC B2949M75A. Here’s the translation:

Boston Whaler, Serial # B2949, Produced August 1975


MIC = Manufacturer's ID Code BWC=Whaler
NNNNN = 5-character production or serial number
"M" = "M" --> an indicator of the Model Year Format
XX = 2-digit year of production
Z = Month of Production, coded

A = August
B = September
C = October
D = November
E = December
F = January
G = February
H = March
I = April
J = May
K = June
L = July

As for the brass drain tubes, I ordered those off of Amazon, as well as a flaring tool to bend the edges of the tube. I thought this installation would be quick and easy, and while it wasn’t necessarily hard, I definitely spent the good part of 5 or so hours doing the job just right. The most important step is that the brass has to be annealed before being formed at the tip. The process is quite simple: heat the brass up until it starts to turn blue (NOT RED), then immediately quench it in some water. This softens the brass for forming. Skip this step, and the brass most likely shatters/cracks when trying to form it with the flaring tool. Recommendations called for a propane torch. I didn’t have one of those, but my crawfish burner worked just fine! Rubber o-rings and more 4200 completed the job and ensures no water will get into the hull. One tube was roughly 3 inches, the other about 12″.

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