Rainbow/Pentair Filter Air Vent Valve, Life Gard Dynamic RTL/RCF/RDC Series. Functions both as air bleeder knob valve and as filter housing drain plug on RDC25 and RDC50 filters.

• Threads into filter manifold top, or filter housing bottom
• O-ring included

Product notes: OEM# 172224X

California Proposition 65 declaration:
  WARNING: Cancer and Reproductive Harm
www.P65Warnings.ca.gov