Filter Connector & Tube Sizing
Be sure you order the correct size connectors and tube for the replacement filters for your drinking water system.
These two filters with the blue and orange "sanitary plugs" are female threaded and require a threaded fitting to be screwed into it. The sanitary plugs are to be removed and discarded as the connector is installed. The blue sanitary plug indicates 1/4" FNPT and the orange is 3/8" FNPT (Female National Pipe Thread) standard.
The following two filters show a 1/4" quick connector and a 3/8" quick connector. Tube size is measured by the outside diameter of the tube. Quick connect fittings are measured on the inside of the port.
- John Guest ® Poly Tubing 1/4" For Pure Drinking Filter Water Systems$0.45 Special Price $0.27 As low as $0.19
- Jaco ® Straight Tube Connector For Water Filter System - Pair$8.99 Special Price $4.99 As low as $2.99
Be sure to check our for important parts such as , , , , , , , and more parts for your reverse osmosis pure water filtration system. View maintenance and servicing tips online at our .
EASY RO MEMBRANE PERFORMANCE CALCULATOR
SEE IF IT IS TIME TO REPLACE YOUR RO MEMBRANE
Simply enter your Feed Water TDS and RO Water TDS into the boxes below and click "Submit". The percentage of TDS Rejection will be displayed. We normally recommend membrane replacement once you drop below 75%. This may vary in areas with high TDS in the feed water.
See our selection of TDS meters under Water Tests.