Watts 276H300 2 1/2 In Hose Connection Pressure Gauge

Yes. The 276H300 has a 3/4 inch female threaded inlet in GHT (garden hose thread), so it screws directly onto a standard hose bibb, sillcock, washing machine valve, or any 3/4 inch male hose thread outlet. No adapter and no pipe dope on tapered threads needed, just the hose washer. If your test point is 3/4 inch NPT pipe thread instead, this gauge will not thread on correctly.

It is a plain indicating gauge. No manual shutoff, no air valve, and no retaining (max-reading) valve are included on the 276H300. So you cannot isolate it or bleed it in place, and it will not hold a peak reading after you remove it. If you need to capture overnight peak pressure on a building supply, order a hose gauge with a retaining valve. If you want to isolate the gauge, plumb a ball valve ahead of it.

Only if the fluid stays between 40 and 140 degrees F. That upper limit of 140 F covers domestic hot water at typical tank settings, but it rules out boiler loops, high-temperature storage, and steam. The 40 F floor also means it should not be left on an unheated or freeze-exposed line through winter.

No. The 276H300 is listed as not Buy American Act compliant, so it will not satisfy a BAA or domestic-content clause on a federal, military, or federally funded project. For those specs you need a gauge with documented domestic manufacture.

The case is steel with a black enamel finish, and the window is Kostil polymer rather than glass, so a dropped gauge is far less likely to shatter than one with a glass lens. That combination is aimed at field and mechanical room service rather than clean-room instrumentation. Steel enamel is not a corrosion-proof case, so avoid permanent outdoor or wash-down mounting.

Lead-free status on the 276H300 is listed as not in scope, which is how gauges are normally classified: a dial gauge is an indicating instrument, not a part of the wetted waterway governed by lead-free potable water rules. If your jurisdiction or project spec demands a certified lead-free marking on every component touching potable water, confirm the requirement applies to gauges before specifying it.