As
thebiglad said....the FPR can be refurbished
Here is how it looks in pieces...the two bits from the bottom of image are the spare parts( the o-ring and the "gasket")
U can take out the little "keg" from the FPR body and see there are two o-rings on it(the middle of image)
....a small and a bigger one.....the small is 10mm/ext. - 5mm/int. and the bigger 26/ext. - 21/int. .....if u can put your hand on this size of good quality(diesel proof) o-rings and replace them the FPR will be like new. The whole rest of FPR body is totally compact high alloy so it cant leak unless its cracked(unlikely)
If some of u guys can find a source for this o-rings let me/us know please...we could save some money in the future...