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John: Hi Richard
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And Richard is with a very big company that makes
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thru-hull fittings. We're talking about PERKO.
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And we're gonna be installing this particular one on
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a different 23 foot Albury Brothers boat today
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on the program. First off Richard what is the
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base material of the thru-hull fitting.
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And what is this beautiful plating
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that's been put over top of it?
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Richard: This is a bronze thru-hull fitting that has been
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chrome plated.
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John: Okay.
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And take a look on how we have these
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threads right here. Well that's for this flange nut
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so that we can tighten it up to the hull side.
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We also have a barb fitting right here,
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our bilge hose slides over the end
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of this barb fitting and then we clamp
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that right there and it doesn't allow it
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to back off.
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Now traditionally, it takes two people
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to install this type of a thru-hull fitting.
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One on the outside of the boat,
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one on the inside of the boat.
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Because what happens is you have put a sealant
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right here on this flange.
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Well if it starts spinning you can compromise
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the gasket and you can compromise the seal.
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It has to be watertight.
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So that's why you have one guy on the outside
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and one guy on the inside.
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But you have come up with a very cool
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new type of thru-hull fitting
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that only takes one person to install it.
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Richard: That's correct.
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John: Let's kinda share with everybody.
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Richard: This is basically a shorten version of the one
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we have on the table there.
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And, the difference is that we've put a
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notch in the back here that allows
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the installer that once they've inserted it into the hole
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and tighten down the flange snugly.
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They can put a screwdriver here to hold
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it place as they finish the tightening process.
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John: That is awesome.
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Now there are much less expensive
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versions of thru-hull fittings.
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The bronze is going to run you, the chrome plated bronze
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maybe about $32 dollars a piece.
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Richard: Correct.
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John: We're putting them in a high-end boat so we don't mind
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spending the money. But, if you are
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price conscience you could also go with
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a reinforced nylon version like this.
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It's going to run you about $8 bucks.
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But, in essence it's gonna do the same thing.
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Richard: Correct.
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John: Let's do this. Let's grab some tools
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and let's real quick show everybody how to put
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one of these into the hull side for the very first time.
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Richard: Let's go!
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(hammer clank effect)
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John: What I have here is a 3/16 inch
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drill bit and I want to use this as a guide hole.
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I wanna start on the outside of the craft
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and I'm gonna come in right here to this
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hashmark. And I wanna drill this
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going all the way through the boat.
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Now this way I gonna have two
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sides to kinda work from.
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I'm eventually going to be using an
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inch and 3/8 (1-3/8") hole saw.
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I wanna cut it from the outside I wanna cut it from the inside.
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Now what I want to do next is I want to grab
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some low contact adhesive masking tape.
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And I want to protect the outside finish
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of the boat as well as the inside finish
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of that fiberglass inner liner.
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And now I going to switch out
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drill bits. I'm actually gonna go to a hole saw.
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A 1-3/8 inch hole saw.
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And I'm first going to cut my hole
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on the outside of the boat and I'm gonna work
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in, towards the craft.
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So I'll take it about 3 quarters of the way in.
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But I don't wanna take it all the way through.
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Because I don't want to bust out the fiberglass
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on the inside of this fiberglass inner liner.
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So instead I'm going to jump on the
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inside of the boat and I'm now going to
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attack it using the same guide hole.
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And kinda make sure that everything lines up.
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Now, what you're looking at here,
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this is some exposed Core-Cell.
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So we wanna mix up a little bit of polyester resin
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and we wanna go ahead and really resin coat
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the entire circumference
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of that hole that we opened up.
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But Richard let's talk about the thru-hull fitting
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because we're at a spot were we need to
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put in our bedding compound.
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And, your guys are
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kinda doing something special with
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the flange to hold bedding
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compounds. What's it all about?
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Richard: That's correct John. This is called a
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"bedding groove". And basically what it
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does is it allows extra
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bedding compound to be placed
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inside the flange. So that you get
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a tighter seal around the outside of the boat.
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John: And is this unique to PERKO?
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Richard: Yes it is.
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John: Okay. Well what we're gonna do is we're
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gonna put a good generous amount of the bedding compound
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on the flange. And we're going
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to slide it in from the outside of the boat
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going in towards the craft.
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Now, where we see the actual
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perimeter of the thru-hull fitting on the
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inside we need to caulk that up
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with our polyurethane adhesive as well.
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And now we can bring in the flange nut.
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And we can kind of snug it into place.
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But we don't wanna crank down on this!
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Otherwise all of the polyurethane
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adhesive is going to ooze out from the
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thru-hull fitting and we're not gonna be sealing anything.
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So instead, we wanna let it kinda
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cure overnight. We'll come back in the morning,
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we'll go ahead and crank it tight.
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This way we have a nice gasket,
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we're really going to get a good seal.
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Well hey right now we need to take another timeout
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but keep it right here because when we come back,
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we're gonna be down in Miami, Florida.
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We're gonna show you how this is manufactured,
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thru-hull fittings. They're actually casted out of bronze
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and if you're into fire. This next segment
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is gonna blow you away.