The green valves that have served the irrigation industry for over 48 years.
Never hand-tighten a gauge by its body; always use the wrench flats. Mount the gauge at or below eye level to reduce parallax errors (visual angle errors). Be sure the case is not distorted by miss-located or over torqued mounting. To avoid contaminating the pressure measuring system in the gauge, leave the protective cap on the connection fitting until just before the line connection is made. If a thread sealant, such as Teflon tape, is used, be sure the sealant is compatible with the contact fluids. For example, never use Teflon tape in the presence of silicon; use rector seal instead. Using the wrench flats, make the fitting up to proper tightness to prevent leakage. Do NOT, however, over tighten the fittings since they may then be damaged beyond repair. Do NOT use the gauge case to screw the gauge into place on the line fitting.
