Armstrong model 1811 inverted bucket trap with a 3/4" NPT connection, 1040 PPH capacity, and in-line horizontal configuration for service up to 15 psi. Armstrong 1800 Series bucket traps feature side inlet/outlet all-welded construction, which is ideal for applications such as tracer lines, drips, heating, and processing. They also feature freeze-resistant, all-stainless steel construction. This trap offers excellent purging action, as well as, continuous air venting.