New engine crankcase breather adapters from XRP shown in three styles. From left to right: 1) Straight through tube only. 2) One-way pop off with fully adjustable engine vacuum control. 3) One-way pop off with normally fully closed check valve, non adjustable. Black anodized aluminum. All have a -12 male O-Ring boss thread and may use any commonly available 1-3/8″ crankcase filter. (Not included) Also shown is an aircraft style -12 female O-Ring boss weld-on port, 6061-T6 aluminum, with raised flange base that is designed to prevent thread and seal area distortion when welded. (Sold separately

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