I have 2 No. George Fischer Waga 3007 couplers, range 315-356, Brand new unused still with end caps on. Generally retail around £900+ vat each, i am open to offers. the price shown on the listing is per item not for both.
I have 2 No. stainless inserts for SDR11 PE100 pipe so at least one of these can be used on plastic pipe, or both if connecting PE100 SDR11 onto ductile.. 
Can arrange delivery at additional cost if required