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Maestrini Brass Anti-Siphon Loop (3/4" BSP / 1/2" BSP Vent) Cleaning brushes PISTON ASY-PORT 700-8M0119585 Mercruiser MercuryThis Maestrini anti siphon device is made from brass. The anti siphon device allows fluid to flow in the intended direction but when the flow is reversed, the vacuum will operate the anti siphon valve which will break the siphoning effect. This anti siphon loop is used in conjunction with 410023 siphon break valve. Typical applications for this anti siphon loop are boat water intakes, exhaust injection lines and toilet systems where installed