"replace it as" is a valid phrase and can be used in written English.
For example: "We need to replace it as soon as possible."
Buy a replacement expansion valve (also known as an orifice tube) if you plan to replace it as well.
We will do our best to replace it as soon as possible.
Many people believe a new protocol will replace it as early as next year.
The federal government promised to replace it as long as Congress provided financing, but environmental concerns and high costs halted construction in 1972.
Indeed, I am wearing a poppy as I sit typing this, and will replace it as soon as I lose it, and indeed the next 12 that go the same way before Remembrance Sunday.
Trump has made it clear that he plans to repeal the health care law as soon as possible and replace it as soon as his HHS secretary is confirmed.
The NIST certifies this material for several years, monitors its stability, and replaces it as necessary.
She swaps out the memory card and the battery for fresh ones, stands up on her bike pedals, and replaces it as carefully as she can.
Barclays stepped in for DFC, a bankrupt New Zealand mortgage bank in 1989, replacing it as a counterparty for all its interest-rate swaps.
Indigo eventually replaced it as the principal Central American export.
It proceeds to destroy the tongue before replacing it as a new host tongue.
