Patent ID: 8505568

Claim:
A device for use with a system pipe, said system pipe having a hole formed therein, said device comprising: (a) a standpipe attached to and in fluid communication with a system pipe, said system pipe having a hole formed therein so that fluid or gas flow from said system pipe through said hole into said standpipe; (b) a magnetic float carried within said standpipe, said magnetic float floatable in fluid and freely movable vertically in said standpipe with the level of fluid in said standpipe when said fluid flows from said system pipe into said standpipe; (c) an upper float stop carried within said standpipe above said magnetic float, said upper float stop limiting upward flotation of said magnetic float, said upper float stop having flow holes formed therein though which fluid flows when said float is against said upper float stop; (d) a vent valve attached to said standpipe and in fluid communication with said standpipe for venting gas from said standpipe, said fluid passing around said magnetic float without being blocked; and (e) an indicator exterior to said standpipe and responsive to movement of said magnetic float within said standpipe to thereby indicate the level of said fluid in said standpipe.