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Amazon.com: 1"NPT Male 304 Stainless Steel Oil Sight Glass Hex Head Sight Plug Liquid Level Gauge Oil Indicator Sight Window for Air Compressor Gearbox Fittings Hydraulic Tank (1pcs 1 NPT Stainless Steel)
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3/4'' NPT Male Hex Head Stainless Steel Oil Sight Glass Liquid Level Gauge Oil Indicator Window For Air Compressor Gearbox Fittings Hydraulic Tank Sight Glass (3/4'' NPT Male) - Amazon.com
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