there are many available, most look like this:
these are mine - on the ground, then there are some you can customize in size length to suit your install...like the links to these other threads

http://img.photobucket.com/albums/v2...4/100_2895.jpg

http://www.poolforum.com/pf2/showthread.php?t=3409

http://www.poolforum.com/pf2/showthr...highlight=part