model 53992 or 53993
edit correction model 51992 ...
apparently you have to buy the entire tank. Cheapest I've found is $18 cdn +
+tax and shipping from USA.
My Canadian source is a 'Call Us'. not a good sign.
The unit that I have seems to consume too much gas so I assume it's leaking. The primer to tank hose was actually 2 hose joined and grommet is cracked. Maybe will see if I can do one line and seal-all the grommet and see if I can pinpoint any fuel loss.