The M12 and M18 Lithium-ion platforms now offer ProPEX installation tools with auto-rotating heads. Designed for one-handed use, each allows users to install PEX fittings up to four times faster and is compatible with other batteries in the platform. Both are available with the tool alone or as a kit. Cost: $199 to $399 (tool) or $399 to $699 (kit). Milwaukee Electric Tool Corp. 800-729-3878. www.milwaukeetool.com.