• specifications
• Plan

 HAND MADE INNER TUBES  for  INFLATABLE  PRODUCTS  since 1989

4000 tubes, 3 complaints.  5 years warranty.

UK  M.o.d,  Rolls Royce, Universities, Far East Navies, Volvo and many other well known Institutions.

5 year warranty

Please note, it takes 6 working days to make and test a tube, this is due to 4 steps of gluing, then waiting each time for it to cure, (24 hours).

We do not make inner tubes out of thinner welded material, we tried it years ago. The problem is that it is difficult to ensure that the inner tube totally fills the outer tube on installation. The thinner  inner tube is then overstressed, and fails. usually on a weld, or seam.

 Key

 Fig.1.Leave existing valves in situ, providing they do not project into the tube.

OR you remove them, and we  put the new valves on the new inner tube to mate up

with the existing holes.

 Fig.2.Cut a vertical 6" (150mm) slot from just above the deck, and a 45mm diameter

 hole along side the cut

Clean the inside of the outer tube with a vacuum cleaner, particles inside may damage the new inner tubes.

 Fig.3.Turn ends of Inner Tube inside out. Thereby reducing a 3 meter tube to 2 meters.

 Rub a piece of chalk over  the inner tube seams not all over the tube

 Fig.4.Insert the Inner Tube, first in one direction, put valve in hole, insert remaining Inner Tube.

 Fig.5.Ensure there are no Twists in the Inner tube.

 Fig.6.Insert Valve core and commence gentle inflation, the inside out tube will now extend to fill

 the chamber

 Fig.7.Tube is now fully inflated and NOTE THE CUT IN THE TUBE STAYS CLOSED

 Air Leakage                           Less than 1 % in 3 months

 Temperature Range              -25°C to +75°C

 Elongation to Break               200 %

 Tubes are GLUED with a superior marine standard product, in the proven traditional

 manner. Welding reduces the thickness of the material, resulting in a burst seam if the

 inner tube does not totally fill the tube cavity on initial inflation , (and in our experience,

 it never does)

 Gemini inner tubes just stretch to fill the tube 100%. The Inner Tubes are so flexible they

 can be folded hundreds of times without cracking or leaking.  We have been supplying inner

 tubes since  1988, to clients in Holland, Germany and the UK with 99.9% successful

 installation and operation. (nothing is ever 100%)

 Made from 1mm thick PVC with a lower air loss than standard tubes. Typically less than

 1% in 6 months.

 Below is our available sizes and respective retail prices

 Tubes available in any Length, Ø and Shape

Color	Length CM	Length inches	Art No	£	Weight Kg	Weight Lbs
	200	78.74	2002	113	2.9	6.174
	300	118.11	2003	126	4.5	9.925
	400	157.48	2004	136	5.2	11.465
	500	196.54	2005	155	6.5	14.332

 (Note we  sometimes have  Inner Tubes  which have been damaged

 during manufacture,  they will have a small patch  on them on them

 but cannot be sold as new, ask for prices.)

 For the bow section,2 Inner tubes, A and D, are required. 

 1 tube wrapped around the bow cannot fill the area  fully.

Removing the front 2 baffles, means only 4 inner tubes are needed, saving money.