Point Four Systems MBD075 User Manual page 7

Replacement of End Fitting for MBD300 & MBD600 Diffusers
(Point Four diffusers require either a 5/8" or 3/4" imperial or SAE wrench to remove the
end fitting.)
Procedure to remove a cracked fitting:
1. Clamp diffuser frame horizontally in a vice as near to the fitting end as possible with
tile facing upward - be certain the widest or lower part of the channel is between the
vice jaws.
2. A steady even pull with proper wrench will usually remove fitting without breaking.
3. Coat new fitting with a good grade of pipe dope and replace, being careful not to over
tighten.
Procedure to remove the remains of an end fitting that has broken off leaving
threads in the diffuser end-piece:
4. Use the modified drill bit, (supplied with the replacement fittings), to drill through the
broken stub. With a sharp pointed tool, collapse remaining fitting material into drilled
hole and remove.
5. Remove all foreign material from the drilled area with compressed air or gently tap
the diffuser on a bench, block, or wood.
6. Restore threaded end with 1/8" pipe tap (supplied with the replacement fittings), and
replace fitting as instructed above.
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