Plug leaking (spraying!) pressure switch on Raypak 407a

Discovered water leaking from the bottom of the heater today. I thought it might be the heat exchange, but upon pulling a panel, it turns out it's the pressure switch.

I've ordered another, but it's going to take a while. Has anyone plugged the hole left by the switch? If so, what can I use to plug it until the switch arrives?

I won't be using the heater until the new switch is in.

Thanks all!
 
Discovered water leaking from the bottom of the heater today. I thought it might be the heat exchange, but upon pulling a panel, it turns out it's the pressure switch.

I've ordered another, but it's going to take a while. Has anyone plugged the hole left by the switch? If so, what can I use to plug it until the switch arrives?

I won't be using the heater until the new switch is in.

Thanks all!
1/4" plastic (nylon) pipe plug. Best if you don't get a metal one.
 
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