Unscrew the oil filter, there are 2 Allen head bolts that hold the adapter to the block. Remove these bolts and the O-ring is on top of the adapter.

i/o card

According to google if you have an automatic universal adapter, that adapter will automaticly find and adapt itself , the polarity ,voltage,amper , so that means an adapter can adapt polarities as well as voltage and current.

A manual universal adapter on the other hand you have to adapt the polarity manually on the adapter itself , by checking what the device you wanna power has positive or negative, most electronic devices presently use positive .

Check and see what voltage , amper and polarity a device needs.

Positive : +--o)--Minus , Negative : Minus--o)--+

Or Positive: Minus--(o---+ , Negative : +---(o---Minus

And adjust manually to what is required.

i/o card

I/O controller