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These 1-1/4" S-521G Series inline check valves with solder connections are rated for 300 WOG and are IAPMO Certified – NSF 61 / NSF 372
Made from lead free brass with stainless steel ball and stem
Reinforcement: High strength synthetic fiber with anti-static helix wire
Proof of Open/Close Switches
more linear scales
RKI Instruments GX-3R Pro Gas Monitor, 72-PAA-C Cartridge Filters These 1-1/4" S-521G Series inlineRKI Instruments GX 3R Pro, 5 gas, LEL O2 combo H2S & CO ppm CO2 with 100 240 VAC charger The GX 3R Pro is the worlds smallest 5 gas monitor weighing only 4. 58 ounces and fits in the palm of your hand (2. 9 W x 2. 6 H x 1. 06 D). It simultaneously monitors and displays 5 different gases. In addition to monitoring standard confined space gases, LEL, O2, CO, & H2S, the GX 3R Pro has a 5th channel where you can add infrared or toxic gas sensors (Hydrogen
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