The LSP1351 Series fused high pressure steel sight plug has a clear glass sight and male SAE straight thread connection. The fused, one-piece construction allows for higher operating pressures. The sight plug can be accessorized with reflector and float ball. The material choice for o-ring tank seal typically determines the operating temperature range for this series sight plug. Box quantities may apply. Standard Features: Stud end sizes from dash 06 (9/16-18UNF) to dash 28 (2¼-12UN) per SAE J1926/3 Fused clear glass sight Body machined from cold finished steel bar stock Electroless Nickel finish Available with reflector and float ball or just reflector Pressure & Temperature Ratings: Temperature ratings vary by material selection for o-ring tank seal. Pressure ratings vary by sight plug size, refer to spec sheet for complete details. Caution: Do not use an impact wrench to install a fused sight plug. Not recommended for steam applications. Scratched glass significantly reduces the pressure rating of the sight plug.