PLASTIC DYNA NIPPLE FOOT VALVE

 It allows water to flow upward into the pump but prevents it from flowing backward (backflow) when the pump is off, which is crucial for maintaining the pump's prime (keeping the pipe full of water).

"Plastic": It is made from durable, lightweight, and rust-proof material like Polypropylene (PP) or PVC.

"Foot Valve": Indicates its function as a check valve submerged at the "foot" or bottom of the suction pipe, combined with a strainer (screen) to filter out debris and protect the pump.

"Nipple": Refers to the integral, short, threaded connector (nipple) that allows for a direct, easy, and secure connection to the suction pipe.

"Dyna": This is a specific brand name or model type used by several manufacturers in the plastic plumbing industry, signifying a particular robust design (often referring to a specific spring or flap mechanism) aimed at durability and reliable performance in demanding applications like deep borewells.