1/4" BSPP ECO Liquid Level Gauge 150mm - SEE80150 Liquid level gauges are available up to 1 metre, each gauge above 400mm is supplied with a upper tank bracket. Thread sizes available in G1/4" , G3/8" , G1/2" BSPP Male • Suitable for many industrial & domestic usages, subject to pressure & material compatibility. Pressure: Atmospheric. Lower Body: Brass, nickel plated. Fixing Bolts: Brass, nickel plated. Seals: FKM. Sight Tube: Polycarbonate. Guard Tube: Polycarbonate. Top Cap: Brass. Adaptor: Brass. Tank Seals: Walkertite washer.