Found this earlier thread by another bro.
If not, you can top-up at blk 22 Boon Keng Rd, on the spot top-up.The place is:
Leong Chew Gas & Trading
Blk 3013 Bedok Ind Park E #01-2108
I would think they only exchange if your cylinder is of the same make. The cylinder looks like this:
http://www.aquaticquotient.com/forum...ad.php?t=16876
Hope this help.









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