if there's a valve in the line you should be able to see it, they don't fit inside anything, they're a separate small metal unit the hose connect to, see the pic I posted above, that one is threaded on the carb end with a hose nipple on the other end

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics