Outer Limits 4x4 Board

Hi All
My ever so faithful 12V air compressor has stopped, I pulled it apart and there is a small thin metal flat plate missing from the top of the piston I assume it is one of the 2 valves, can anyone advise if these can be replaced and id so where would I look to source the part, failing that any recommendations for a replacement around the $200 mark.

Cheers
Teg

P.s. Only ever used to pump up tyres.

brand? make? model?

Hey Bogged
It's a "Super Force Pro Heavy Duty"
Doesn't say anything about model but has:
"Plu 102860
Code JD101
72 L/Min
I think I bought it from Super Cheap some years ago and has been a great compressor up until now, also I recon it is just a re-badge of a mass produced compressor that has many different names.
All else seems OK, shame to just chuck it.

Teg

Always very hard to find spares for these cheaper units... Go to Supercheap and ask about it.