Sight Glass Gasket Holder (Early Assemblies) Gasket-retaining holder for sight glass assemblies on early-generation Faema, Futurmat, Mairali, and VFA boilers. COMPATIBILITY Fits: early/older sight glass assemblies on Faema, Futurmat, Mairali, and VFA machines INSTALLATION Basic hand-fit component, replaced along with the sight glass gasket during boiler service. PRO TIPS Inspect for corrosion pitting where the holder seats against the boiler — a pitted holder is a common source of a weeping sight glass even after installing a fresh gasket.