don't know how high a pressure they used, but keep in mind the tank is not pressurized in use .... I'd just put a dab of any good RTV or gasket maker on the holes before installing the screws, or at most wipe a light layer of sealer on the underside of the rubber seal

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 & Rust-a-holics Unanimous parking lot