Irrigation Products Plug Locks The easy way to secure irrigation pipe plugs... no more driving fence posts to hold plugs. The Plug Lock also is an easy tool to pull pipe apart! Available in 6", 8", 10" & 12"   Valve Locks Secure irrigation valves with ease. Available in 8" & 10" sizes. Metal Dam Supports Item Number: Dam-133 (A=12" B=33.5" C=15") Item Number: Dam-139 (A=12.25" B=39.25" C=19") We can also build custom supports to any dimension.