API Replacement Test Tubes for Pond and Aquarium Test Kits

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API® Replacement Test Tubes are the spare glass tubes that fit every API liquid reagent test kit for ponds and aquariums. If you've broken a tube, lost one, or just want a clean se t for troubleshooting, this 4-pack is the answer. Fits These API Test Kits API Pond Master Test Kit API Pond Wide Range pH Test Kit API Ammonia / Nitrite / Nitrate / Phosphate Test Kits API Freshwater Master Test Kit API GH & KH Test Kit Includes 4 glass tubes with caps. Rinse after every use to keep them clear. Currently out of stock — contact us if you need these sooner. Product Video Show more