Neat idea but scary stuff removing a seacock while the boat is in the water. When I first brought my boat I removed every seacock and in the process every skin fitting rotated in the hull of the boat. I would hate this to have happened while the boat was in the water.
All my skin fitting are now welded into the hull now, so I could safely use this device. But are you confident about your skin fittings not turning as you remove the seacock or giving it that final nip as you tighten them back up.
Scary stuff. 
www.seabung.com/shop.html $75 US for a 60 and a 90mm. Expensive for the plastic, reasonable for the design and marketing investment, cheap compared to a haul out.
Great inventions are often so simple! I suppose it could also work for a small hull puncture or crack if you could drill a hole to size with a hand drill.
On another forum someone seems to have had even more success by shoving one of these in from the outside (in water), which seems very doable and cheaper at $33: 
www.cruiserlog.com/forums/f43/in-water-seacock-replacement-8623.html
Yeah, he did not use any sealant, gas check or something and he did NOT DOUBLE CLAMPED IT!
Brilliant, if one is clever enough, could one make it out of a tube of silicon?
you can see evidence of double clamp.
they do not want to bore you with every step of the process.
Be buggered if i could find anything when or if i need it in my boat but a fifty cent foam football from the $2 shop be a solid investment
Select to expand quoteCrusoe said..
every skin fitting rotated in the hull of the boat. I would hate this to have happened while the boat was in the water.
Scary stuff.
This was my experience too. As I was watching the video, I was wondering if I would do that at sea or not. At least in the marina you might have half a chance of getting help.
Select to expand quoteToph said..Crusoe said..
every skin fitting rotated in the hull of the boat. I would hate this to have happened while the boat was in the water.
Scary stuff.
This was my experience too. As I was watching the video, I was wondering if I would do that at sea or not. At least in the marina you might have half a chance of getting help.
just like changing a tap washer.... hold against the force to prevent damage.
Yep, riffraff you are right. It is my old eyes.
I do not think anything is likely to go wrong being in the Marina or at open sea. It is simple physics.
If one had to do it out there, does the fact not tell a whole story of the maintenance and possible condition of the vessel?
The mighyt RN used to use technics like fothering - that is a sail around the hull tied to the gunwales - to stop or moderate a bad leak.
Our hero in the movie 'All is lost' could have used this solution covering his emergency fglass repair.
Select to expand quotesaltiest1 said..Toph said..Crusoe said..
every skin fitting rotated in the hull of the boat. I would hate this to have happened while the boat was in the water.
Scary stuff.
This was my experience too. As I was watching the video, I was wondering if I would do that at sea or not. At least in the marina you might have half a chance of getting help.
just like changing a tap washer.... hold against the force to prevent damage.
Yeah, Yeah, you should have been there to help me out salty. In the end I took an 5" angle grinder with a 1mm blade and cut the whole lot out, hull and all. This was after hammering wedges up into the skin fitting from out side to try and stop the little buggers turning. I won in the end, but I can assure it wasn't just a simple as changing a tap washer.
I have two tapered sea cocks in the forward cabin I'm removing and epoxy up the holes.
Last on the hard I removed the tapers and greased them up with some thing .Id be to scared to open them in the water for fear of seizing open .
Ill be glad when there gone two less holes in the boat so far 5 less holes
Select to expand quoteHG02 said..
I have two tapered sea cocks in the forward cabin I'm removing and epoxy up the holes.
Last on the hard I removed the tapers and greased them up with some thing .Id be to scared to open them in the water for fear of seizing open .
Ill be glad when there gone two less holes in the boat so far 5 less holes
They sound like real Blakes seacocks. I would be inclined to leave them and service them every now and again and store a wood tapered bung on a lanyard nearby.
Quote from H28 club
Herreshoff had very firm ideas on boat building, and he was not afraid to express them. He had an aversion to motors, ("which cause noise, smell, drag, added cost, extra weight, dirty bilges..."), flashy gadgetry, {"which lines the pockets of manufacturers and advertisers, while doing little for sailing performance...."}, ice boxes, and any unnecessary holes below the waterline. He was an outspoken exponent of timber construction, and the use of a cedar bucket for the toilet. He was also quite uncompromising when it came to any modification to the design of his H28. In his 1943 description of the boat plans in 'The Rudder' he wrote; "If H28's design is only slightly changed, the whole balance may be thrown out. If you equip her with deadeyes, build her with sawn frames, or fill her virgin bilge with ballast, the birds will no longer carol over her, nor will the odors arising from the cabin make poetry, nor will your soul be fortified against the world of war lords, politicians, and fakers.
and my boats made out of snot according to Herreshoff. I nearly called her "Snotty"
