![Forespar MF 841 Vent Cap Assembly [903002]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/1280x1280/products/8503/9723/73260XL__69927.1638249901.jpg?c=1 "Forespar MF 841 Vent Cap Assembly [903002]")
![Forespar MF 841 Vent Cap Assembly [903002]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/8503/9723/73260XL__69927.1638249901.jpg?c=1 "Forespar MF 841 Vent Cap Assembly [903002]")
MF 841 Vent Cap Assembly
Installing one of our vented loops will ensure that fluids will not siphon from tank to tank. Vented loops are commonly used in the marine toilet system and engine cooling system. The simple valve system incorporated in the top of the loop allows air to enter the line when not in use, yet effectively seals as water or other fluid passes through. Molded in Marelon, neither vent nor loop will corrode. The duckbill one way valve is designed to seal properly if particulate matter is present in fluids.
Specifications:
- Type: Vented Loops
- Box Dimensions: 1"H x 1"W x 2"L WT: 0.1 lbs
- UPC: 028026148735
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![Forespar MF 845 Vented Loop - 1\/2" [903008]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/8508/9728/73265XL__69815.1638249909.jpg?c=1 "Forespar MF 845 Vented Loop - 1\/2\" [903008]")
![Forespar MF 842 Vented Loop - 3\/4" [903001]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/8502/9722/73259XL__89856.1638249895.jpg?c=1 "Forespar MF 842 Vented Loop - 3\/4\" [903001]")
![Forespar MF 843 Vented Loop - 5\/8" [903003]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/8504/9724/73261XL__01392.1638249903.jpg?c=1 "Forespar MF 843 Vented Loop - 5\/8\" [903003]")
![Forespar MF 839 Vented Loop - 1-1\/4" [903011]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/8509/9729/73267XL__58233.1638249910.jpg?c=1 "Forespar MF 839 Vented Loop - 1-1\/4\" [903011]")
![Forespar MF 847 Vented Loop - 1-1\/8" [903018]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/8510/9730/73268XL__50915.1638249911.jpg?c=1 "Forespar MF 847 Vented Loop - 1-1\/8\" [903018]")
![Forespar MF 840 Vented Loop - 1-1\/2" [903000]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/8501/9721/73258XL__89006.1638249893.jpg?c=1 "Forespar MF 840 Vented Loop - 1-1\/2\" [903000]")
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![Forespar MF 765\/8 Cleat (834030) [941015]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/27886/36134/68389XL__17211.1646189729.jpg?c=1 "Forespar MF 765\/8 Cleat (834030) [941015]")