Optrel P550

[Seano]

Don't suppose anyone knows where I can get a replacement filter cart for one of these, without paying Optrel's prices preferably... picked one up for a song on the flea, but slightly intermittent action....

http://cgi.ebay.co.uk/SPERIAN-OPTRE...=UK_BOI_ProtectiveGear_RL&hash=item27bbd42ba5