Remove the check valve (Item 1) [Figure 20-40-10].
Installation: Tighten the valve to 22 ft.-lb. (30 N•m) torque.
Remove the O-rings (Item 1) and back-up ring (Item 2) [Figure 20-40-11] from the check valve.
Install new O-rings and back-up ring on the check valve.
Clean and inspect the screen (Item 1) [Figure 20-40-12] on the end of the valve.