Mira 88 B - post 1984

A: 

It is an ordinary right hand thread.

 

They can be difficult to shift.

 

First go round the edge of the cover giving it some sharptaps with a hammer you have to be firm but not enough to damage it, then pourtwo or three kettles of boiling water over the cover and try slackening off, ifit doesn’t work repeat two or three times it should eventually come away.

 

If that doesn’t work I would try some TNT!

A: 

If it is dripping then it is the two small ‘O’ rings on the end of the pistons that shut the water off make sure that they are correctly in place and are not damaged.

 

The 88 is designed as a low pressure valve, however if the pressures on the combi are not too high and they are reasonably well balanced the 88 can work.

 

Basically my advice is try it and see if it doesn’t work then I would go for one of Mira’s 415 range

http://www.showerdoc.com/showers/mixer-showers/mira?pg=2

A: 

I am afraid that there is nothing that will be a straight forward swap.

 

Assuming that it isn’t connected to a combi boiler.

All I can suggest is fitting a complete set of internals and new knobs this should restore the easy operation of the valve

A: 

It is probably the cover plate seal that is faulty.

http://showerdoc.com/shower-spares/mira/MIRA-PARENT-76-Mira-88-B---post-1984

Fitting a service kit should solve the problem.

http://showerdoc.com/shower-spares/mira/MIRA-936-12-Mira-Service-Pack-components-Identified-B-936-12

A: 

Unless you are on a combi boiler a strip down clean lube and fitting a seal kit should solve the problem.

 

88B/88 are the same the B stands for “built in”

A: These problems should be solved by fitting a service kit which can be ordered online by clicking on the link below.
Yes the diffeeence is just exposed and built in.

http://www.showerdoc.com/shower-spares/mira/MIRA-936-12-Mira-Service-Pack-components-Identified-B-936-12

A: If correctly installed it is held in place by plastic clips, can be hard to get off and you may have to inseert a small flat screwdriver and lever to getb a start. If asealant has been applied round the edge then it will need to be cut free.
If the plate has had sealant applied to its rear then brute force is the only answer.
Any parts you may require can be ordered online via the link below.

http://www.showerdoc.com/shower-spares/mira/MIRA-PARENT-76-Mira-88-B---post-1984

A: You should be able to cure this problem by fitting a service kit, and yes it can all be done from the front of the unit. The service kit can be ordered online by clicking on the link below.

http://www.showerdoc.com/shower-spares/mira/MIRA-936-12-Service-Pack-Components-Identified--B

A: This can normally be cured by fitting a service kit which can be ordered online by clicking on the link below.

http://www.showerdoc.com/shower-spares/mira/MIRA-936-12-Service-Pack-Components-Identified-B