Yes, those are the ones to use! I have been using those felt clunks and had good results with them.

I'm a believer in using filters - I use one of these felt clunk filters in my gas jug, then another in the tank. I no longer use a filter between the tank and carb because I'm already using one on each end to do my fueling.

Just be sure to use a nylon zip tie over the connection when you attach the tubing. It's a big, heavy clunk. I am now using the smaller Tygon tubing with these clunks - I've had the black neoprene lines split where they go over the large diameter nipple on these clunks.

They are also so large that you are restricted to specific brands of tanks to use. My preference was to use Hayes tanks, but had to go to Sullivan/Dubro tanks to use the felt clunks.

Lynn