Filler Spring for PF6/PF7 Aluminium Frames. Filler Spring for PF6/PF7 Aluminium Frames. SKU: RETCLIPS PF7 Category: Hardware Tag: Filler Spring for PF6/PF7 Aluminium Frames. Description Description Filler Spring for PF6/PF7 Aluminium Frames. Related products Nielsen Polybag Compete Fittings Set Read more Surflon Crimp Wire Sleeves #2-3 Read more FrameTek Frame Space. Clear Spacers. 4.8mm Read more Nielsen Polybag Guilded Fittings Set Read more