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DLFC will be a black plastic elbow housing with 3/4 inch male NPT threads. This housing
contains a flow control washer that limits the backwash flow rate. For backwash flow rates
exceeding 7 GPM, the DLFC will be a black plastic straight housing with 1 inch male NPT
threads.
You will need to purchase suitable pipe or tubing for the drain line, either in 3/4 or 1 inch
diameter, to match the connection points on the drain line flow control assembly (DLFC). To
determine your MINIMUM drain line diameter, look up your model and incoming water
temperature using the chart below.
If in doubt, match the size of your drain line to the
thread size of the DLFC on your control valve.
MINIMUM Drain Line Diameter:
Model
40F Water Temp
70F Water Temp
MT-5810XTR2-8-44
3/4"
3/4"
MT-5810XTR2-9-48
3/4"
1”
MT-5810XTR2-10-54
3/4"
1”
MT-5810XTR2-12-52
1”
1”
MT-5810XTR2-13-54
1”
1”
MT-5810XTR2-14-65
1”
1”
Polyethylene tubing, PEX, PVC, CPVC, or copper pipe are all acceptable material choices for
the drain line. If you are using flexible tubing, be sure that there are no “kinks” or “crimps” in
the tubing after installation that may cause a flow restriction. If used, overhead drain lines
are not to exceed a height of 5 feet above the control valve and should be not more than 50
feet in length. Should an overhead drain line be utilized, it is recommended that the drain
line be increased in size (diameter), and that it not be fastened flush to the bottom of a floor
joist to minimize noise transfer to the upstairs of the building during regeneration.
Using an appropriate fitting, connect the drain line flow control to your drain line tubing/pipe.
The DLFC can be removed from the control valve to facilitate easier plumbing if desired. To
remove the drain line flow control, pull on the retaining clip to remove it and then grasp the
