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Slotted Design for Easy Underwater Installation
TD-S has a single and a slotted mounting hole for 1/4" fasteners. With the slot, it has a 1-5/16" to 1-5/8" center-to-center mounting stud range.
TD-L has a two slotted mounting holes for 1/4" fasteners. With the slots, it has a 1-9/16" to 2-9/16" center-to-center mounting stud range.
Built to military specification MIL-A-18001
Made in California, USA