Neck Adaptor (Square to Square) ModelNeck Size (mm)Spigot Size (mm) QSM-NASS-45150450x450150x150 QSM-NASS-45225450x450225x225 QSM-NASS-45300450x450300x300 QSM-NASS-45375450x450375x375 Description The LinkedAir neck adapator (Square to Square) is made out of galvanised steel and used when the reducing square spigot required. Black paint internally. Custom sizes are available upon request. Product Code QSM-NASS