tech_support In reply to What is part number for 3/4" by Raja Sait March 21, 2023 Raja, regardless of tailpiece size (1/2" - 1") or connection type for our 521 mixing valve series, the replacement washer part number is R20011. You will need to replace 3 of them, at the connections of the hot and cold inlet and the mixed outlet. Reply
Raja, regardless of tailpiece size (1/2" - 1") or connection type for our 521 mixing valve series, the replacement washer part number is R20011. You will need to replace 3 of them, at the connections of the hot and cold inlet and the mixed outlet.