I've mounted several of these in the past, and used the sampling valve installed in the end of the mount, but have not had any leak. I have had the fittings leak on the older cast alluminum mounts, but never on the billet alluminum mounts. I try talking people to use the "single" by-pass, and return the oil back through the oil "fill" cap like Lee Weber does. This makes for excellant sampleing, as there is nearly no chance for contamination entering the sample bottle.
Wayne
amsoilman
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94'SLT 4X4 AT/White in color. Factory Tow Hooks & Running Boards. Amsoil By-Pass filter, Amsoil Air cleaner,and all fluids are Amsoil. Optima "Red Top" batteries.
BD exhaust Brake, BD Torque Lock, BD Torque Converter, Dr. Performance Stage II Injection Pump. Mag-Hytec Diff Cover,Mag-Hytec Transmission Pan, Isspro Pyro, Boost,Oil temp Gauges mounted in 3 Gauge post mount. One gauge monitors Engine Oil, Trans, Diff. Temps.
Wayne Owen