What is the difference of partial rebreather mask and non rebreather mask?

Answer 1

Partial rebreather masks has no one way valve so patient can and will inhale his own exhaled air.
In non rebreather mask due to one way valve, patient can't inhale his own expired air.
Both have O2 rervoir bag (from which they will inhale)

Answer 2

what valve do you remove to make a non rebreather mask a partial rebreather mask