cheap too;
[url=http://cgi.ebay.com/4-PVC-Sch-40-Check-Valve-w-Cleanout-Plug_W0QQitemZ270206631708QQihZ017QQcategoryZ42133QQrd
Z1QQssPageNameZWD1VQQ_trksidZp1638.m118.l1247QQcmdZViewItem]4" PVC Sch.40 Check Valve w/Cleanout & Plug - $12 [/url]
[url=http://cgi.ebay.com/3-PVC-Sch-40-Check-Valve-w-Cleanout-Plug_W0QQitemZ270206630783QQihZ017QQcategoryZ42133QQrd
Z1QQssPageNameZWD1VQQ_trksidZp1638.m118.l1247QQcmdZViewItem]3" PVC Sch.40 Check Valve w/Cleanout & Plug - $14 [/url]