The LSP151 Series low pressure brass sight plug has a clear glass sight and male PTF pipe thread connection. Designed to be an economical alternative to high performance fused sight plugs, the LSP151 Series sight plug features a tamper resistant construction and can be accessorized with reflector and float ball. Box quantities may apply. Standard Features: Stud end sizes from 1/4 inch NPT to 2-11½ inch NPT Clear glass sight Body machined from cold finished brass bar stock Available open view, with reflector or with reflector and float ball Pressure & Temperature Ratings: Maximum operating temperature up to 180°F (82°C). For applications requiring maximum operating temperatures in excess of 180°F (82°C), consult factory for available options. Pressure ratings vary by sight plug size, refer to spec sheet for complete details. Caution: Do not use an impact wrench to install sight plug. Not recommended for steam applications. Scratched glass significantly reduces the pressure rating of the sight plug.