Replacement Crystal for NTH 44mm 2K1 Subs (Swiftsure & Thresher)

Please note this item is not returnable.

Double-dome sapphire replacement crystal for the NTH 44mm 2K1 Subs (Swiftsure & Thresher), with two layers of interior anti-reflective coating. This crystal measures 33.5mm in diameter, and ~3.05mm in thickness.