USAFretired
ArboristSite Member
The filter in the link that Brian sent might not fit the P26. It is for most models of P20, P21 and P25. The P26, P28 and 1074 will most likely take a different one, it's larger with a molded rubber surround.
Found this on ebay for the P26 filter.
http://cgi.ebay.com/PIONEER-P28-P26...emQQptZLH_DefaultDomain_0?hash=item1e5a8fe09c
Joe