For all those who have been tormented by not knowing exactly what filter
will replace the extinct original in a mid-70's "industrial hangup" central
vacuum filter found in some of the larger models of that era, I have found
it. Apparently, Shop Vac corporation was responsible for the manufacture of
these machines for Airstream in some way, and the original part number
(listed in my A/S Service Manual) for the filter was 915-01. Shop Vac tells
me it was superseded years ago by part number 903-19. Nobody (but nobody)
seems to have them in stock except Shop Vac. They are $10.70 apiece if you
buy online at
http://www.shopvac.com/dev/catalog/detail.asp?partnum=90319&Submit=Go%21
and a little more if you order by phone at
570-326-3557
Marc Bossiere
1978 Excella 31'