b'Harken Vang-MasterHarken Vang-Master is squeak-free. Living proof: the rigid vang thats easier to live with, is also easier to specify, rig, and buy. WATCH HARKENVang-Master mechanical vangs are pneumatic. Yes, they use air VANG-MASTER VIDEOto hold booms up to the height you desire. Yes, they offer precise pressure adjustment to hold exactly that level. And yes, they offer owners the ability to select from a menu of external purchase systems with line pre-measured and spliced to all Harken hardware. But no, were sorry there will be no fluid to leak or springs to squeak all night on your off-watch.Construction is hardcoat-anodized 6061-T6 aluminum. Tubing and end fittings are threaded together to eliminate fasteners and dissimilar metals coming together and corroding. Units come in four different cylinder diameters, with Harken tech support and spare parts. Theres a menu of 120+ build lengths for everything from Moore 24s to Andrews 70s to compare with your own pin-to-pin measurement. Replacing aging vangs is easier now. Were pumped! 8'