Forespar Marelon Vented Loops
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  • Forespar Marelon Vented Loops

Forespar Marelon Vented Loops

Installing a vented loop will ensure that fluids will not siphon from tank to tank. Forespar Marelon 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. Marelon is the only synthetic material to pass the stringent Marine U.L. testing.

All critical hose connections should be double clamped at both ends. Ideally, the hose clamp screws should be mounted opposite one another for maximum security. Use the highest quality AWAB hose clamps for longest life and best performance.

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$32.06 / ea
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Tech Spec Product Info User Generated Content
Item No.  Barb size or Hose ID (inches)  Height (inches)  Width (inches) 
FOR-903008  1/2"  5-1/4"  4-1/4" 
FOR-903003  5/8"  5-1/4"  4-1/4" 
FOR-903001  3/4"  4-1/2"  3-3/4" 
FOR-903007  1"  5-1/4"  4-1/4" 
FOR-903000  1-1/2"  6-3/4"  7-3/4" 
BRAND: Forespar
Material: Marelon
Type: Vented Hose Loop
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by PowerReviews
Forespar Marelon Vented Loops

(based on 1 review)

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Reviewed by 1 customer

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(1 of 1 customers found this review helpful)


Marelon does not corrode

By Dudley

from Dracut, MA

Verified Reviewer


  • Does not corrode
  • Impervious
  • Light weight
  • Prevent siphoning
  • Strong


  • none

Best Uses

  • Boat head system

Comments about Forespar Marelon Vented Loops:

Marelon plumbing components are rugged, well made and do not conduct electricity- no bonding needed. Much lighter than the bronze equivalent part.

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