Yup, 1 1/4" PVC threaded cap will work. Same threads.
I'd recommend cutting the cap down so it tightens on the tapered threads
of the filler tube or the flat of the tube, rather than on the flat
plastic of the horseshoe shaped mounting plate. Or put some plumbers
grease on the flat part. That baby will be harder than heck to remove if
it's turned down tight on the flat. I tightened my trial piece down
snug with my fingers, and had to use a wrench to get it off.
RonC
Ron & Linda Clark
North Plains, ORYGUN
78 Eleganza II
I'd recommend cutting the cap down so it tightens on the tapered threads
of the filler tube or the flat of the tube, rather than on the flat
plastic of the horseshoe shaped mounting plate. Or put some plumbers
grease on the flat part. That baby will be harder than heck to remove if
it's turned down tight on the flat. I tightened my trial piece down
snug with my fingers, and had to use a wrench to get it off.
RonC
Ron & Linda Clark
North Plains, ORYGUN
78 Eleganza II