These are replacement O-rings for Manifold Nipple Fittings.
This O-ring is a replacement for the O-ring Manifold Nipple Fittings. The O-ring should be removed, cleaned and inspected periodically. If dry, it should be lubed with O-ring lubricant (HLUBE). If damaged, it should be replaced. O-ring lubricant will prolong the lifespan of O-rings and help create a watertight seal.
TMRNOR 3/4" Nipple O-ring Fits: TMRN 1" x 3/4" Manifold Nipple
TMNOR 1" Nipple O-ring Fits: TMN 1" Manifold Nipple