for Housing Slimline 1/4 inch DH4200W25 PN DMOR4 ( common for many under sink reverse osmosis systems like the Water Shield and HOMERO450 we sell ).
Used with WaterShield brand RO listed on our website.
Also a replacement for other brands, including but not limited to:
Watts Flowmatic OR-4 O-Ring Information:
The Watts Flowmatic OR-4 O-ring is the replacement oring for Watts Flowmatic 500, 4000, 4200, 7000, and Watts VIH Housings.
The Watts Flowmatic OR-4 O-ring is the replacement oring for Watts Flowmatic FMRO5G and FMRO4G Sumps.
It is important to keep the OR-4 oring lubricated with silicone lubricant to prevent leaks in the water filtration system.
The OR-4 oring should be replaced every two filter changes or if there is damage to the OR-4 oring.Outer Diameter of O-ring DMOR4 is 3 1/2 inches, and should not be confused with o-ring DM151121, which is 3 9/16" O.D.