Pentek 151231-27 O-Ring for 3/8" Slimline Housings has a 3" diameter and is used with:
US-600(A)
SY-2000
SY-2300
SY-2300S
SY-2500
SY-2650
RO-3000
RO-3500
ACE 4158622(A)
WRO-3000
WRO-3500
WLCS-1000
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