If you dont mind me asking where you got the 1/4” bulkheads please? 1/4” rigid tubing?DIY dosing containers for my Calcium, Alkalinity and Magnesium 3-part. VOSS 375 mL glass water bottles, 1/4” acrylic rods and John Guest bulkheads. Did all 3 of these in less than 10 minutes and happy with the way they came out. Hoping to get my doser set up this week!