Made of polyethylene, in three different parts. Top portion is fitted with thistle funnel and bulb structure through which dilute acids can be poured to react with metal sulphides in the lower base of the apparatus. Gas evolved collects in the middle dome from where it can be released through a leak-proof stop-cock having self lubricating PTFE plug. Base provided with residual outlet with a screw cap for easy cleaning.
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Mahesh Nagar, Ambala, Haryana