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PUMPING HAZARDOUS LIQUIDSWhen a diaphragm fails, the pumpedliquid or fumes enter the air end of thepump. Fumes are exhausted intothe surrounding environment. Whenpumping hazardous or toxic materials,the exhaust air must be piped to anappropriate area for safe disposal. Seeillustration #1 at right.This pump can be submerged ifthe pump materials of constructionare compatible with the liquid beingpumped. The air exhaust must bepiped above the liquid level. Seeillustration #2 at right. Piping used forthe air exhaust must not be smallerthan 1/2" (1.27 cm) diameter. Reducingthe pipe size will restrict air flow andreduce pump performance. When thepumped product source is at a higherlevel than the pump (flooded suctioncondition), pipe the exhaust higher thanthe product source to prevent siphoningspills. See illustration #3 at right.IMPORTANT INSTALLATION NOTE:The manufacturer recommendsinstalling a flexible hose or connectionbetween the pump and any rigid plumbing.This reduces stresses on the moldedplastic threads of the air exhaust port.Failure to do so may result in damage tothe air distribution valve body.Any piping or hose connectedto the pump’s air exhaust port mustbe physically supported. Failure tosupport these connections could alsoresult in damage to the air distributionvalve body.Exhaust Conversion DrawingCONVERTED EXHAUST ILLUSTRATIONPUMP INSTALLATION AREA1" DIAMETER AIREXHAUST PIPINGIllustration #1LIQUIDLEVELSUCTIONLINESAFE AIREXHAUSTDISPOSALAREAMUFFLERMUFFLER1" DIAMETER AIREXHAUST PIPINGConverting the pump forpiping the exhaust airThe following steps are necessaryto convert the pump to pipe the exhaustair away from the pump.Use a Phillips screwdriver toremove the four self-tapping screws(item 1-H).Remove the muffler cap and muffler(items 1-G and 1-F). The 3/8" NPTmolded threads in the air distributionvalve body (item 1‐A).Illustration #2LIQUIDLEVELSUCTIONLINEMUFFLER1" DIAMETER AIREXHAUST PIPINGIllustration #3m07nmdl1sm-rev0513 Models M07 Non-Metallic Page 30