DMfit Quick-Connect Fittings for Water, Water Purifiers and Reverse Osmosis
Explore the range of DMfit push-to-connect fittings for connecting tubing in water treatment systems. The catalog includes metric and inch-size fittings, adapters, valves and accessories for installation and maintenance.
For water purifiers and reverse osmosis systems, choose the appropriate series by checking the tubing diameter, material and operating conditions in the product specifications.
| Material Standards | Outer Diameter Tolerance Limit of Tubing Used with Fittings | |||||
|---|---|---|---|---|---|---|
| Material Options | Fittings Color | O-Rings | Size | Tollerance | ||
| A - Acetal |
Gray, Black, White |
NBR / EPDM |
Small Size |
5/32“, 4mm | ±0.004“(±0.1mm) | |
| 3/16“, 5mm | ||||||
| 1/4“, 6mm | ||||||
| P - Polypropylene | White | 5/16“, 8mm | ||||
| 3/8“, 10mm | ||||||
| 1/2“, 12mm | ||||||
| B - Brass |
Brass or Chromed |
Large Size | 5/8“, 15(16)mm | |||
| 7/8“, 18(22)mm | ||||||
| 28mm | ||||||
| * For use at higher temperatures or pressures, please contact your DMfit representative for assistance. |
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Fitting Working Pressure and Temperature |
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|---|---|---|---|---|---|---|---|---|---|---|---|
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Small Size | Large Size | |||||||||
| 5/32“ | 3/16“ | 1/4“ | 5/16“ | 3/8“ | 1/2“ | 5/8“ | 7/8“ | 28mm | |||
| 4mm | 5mm | 6mm | 8mm | 10mm | 12mm | 15mm | 16mm | 18mm | 22mm | ||
|
1°C (34°F) |
16bar (230PSI) |
11bar (170PSI) |
11bar (170PSI) | ||||||||
|
20°C (68°F) |
16bar (230PSI) |
11bar (170PSI) |
11bar (170PSI) | ||||||||
|
65°C (150°F) |
10bar (150PSI) |
7bar (100PSI) |
7bar (100PSI) |
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| Maximum Permissible Torque | |||||||
|---|---|---|---|---|---|---|---|
 |
1/8", 1/4" | 3/8", 1/2" | 3/4" | ||||
| Plastic |
Maximum Torque |
(N·m) | 1.5 | 3.0 | 4.0 | ||
| Steel |
Maximum Torque |
(N·m) | 7.0~9.0 | 12.0~14.0 | 22.0~24.0 | 28.0~30.0 | 40.0 |
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- Cut the part of the tube to be inserted into the fitting to plane the end. - Make sure to use a clean tube without any foreign material or cracks. |
- When inserting the tube, remove any obstructions before fully inserting the tube. -Inserting the tube into the fitting only takes moderate force. The tube or fitting should not be scratched or damaged in the process, as this is the main cause for water leaks later on. |
- To make sure that the fitting is properly connected to the tube, pull it once. After pulling insert a spanner under the collet and push the tube into the fitting once more for a complete insertion. | - When no play is desired for the fitting and tube, use our company's LC to eliminate the play of the fitting. |
- Make sure to completely eliminate pressure before disassembling the fitting. |
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Material Characteristics |
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