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A few points for you:

1. If you intend to pull this down and use the cylinders as
   singles (with the plugs from Diverite) I suggest you mark
   the left hand thread on the isolator and the corresponding
   valve with a spot of paint. It helps prevent accidentally
   screwing the wrong parts together and stripping the fine
   thread.

2. Be very careful when you tighten the valves into the cylinders
   If you are heavy handed with a shifting spanner you can distort 
   the valve body at the point where the isolator screws in. Use as
   big a shifting spanner as you can to spread the stress.

3. When assembling the isolator into the valves get the cylinders
   parallel and straight. Start one end of the mainfold in a thread or 
   two, then line up the other one and start it very carefully. If
   it feels like it is stripping the thread it probably is. The threads
   are real fine and easy to damage.

4. Ensure the manifold is screwed in to the correct spacing
   so that it matches the cylinder spacing, else you will stress
   the manifold

5. Ensure that the cylinders are straight and parallel when you tighten
   the bands or you will stress the manifold.

6. Set the bands to a height such that you can reach the valves
   under water but not so high that it makes you top heavy. 
   This is very important to practice as it is pointless
   using an isolation manifold unless you can work it quickly. 

Hope this helps.

Guy.

PS. the post about the serial numbers and the left and right
cylinders was a joke. In case you didn't know.

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