Check the listing for details. 10 Pieces - Hunter 181500 PGP Rubber Riser Seals. Condition: New. Listed at 12.99 USD. Ten Pieces - Hunter 181500 PGP series riser seals. (see other listing for set with retainer) Removing the old sealUnscrew the body cap and remove the internal assembly.Place the base of the riser on a solid surface and grip the spring and riser body firmly.With your other hand, snap off the body cap. With your palm on top of the logo cap, pull up with your fingers.While still gripping the spring and body, remove the rubber seal. When you remove the seal, the tension in the spring will be released. Installing the new sealWith the base of the riser on a solid surface, push the retraction spring down below the nozzle turret and hold it there. Carefully work the new flexible rubber seal, flat side up, onto the nozzle turret, and then down onto the riser body. Snap the body cap onto the body. The cap will slide down freely once past the ring at the top of the nozzle turret.Carefully release your grip on the spring.Exercise the assembly several times (push the cap down and let it be pushed back up) to ensure the parts are seated and do not stick.Reinstall the assembly in the sprinkler body, screwing the cap on tightly with your hand.