1) toilet bottom fill valve 2) material: plastic thread 3) water level adjustable ... : 1/2" or 3/8" toilet bottom fill valve 1).the main body is plastic.2) total height ... adjustable.3) Simple and cheap design, popular4) inlet valve size: 1/2" or 3/8"5) water level ... as basin drainers, bathtub drainers,sink drainers,water tank fittings,WC connector , stamping parts,machining parts,and rubber&plastic ...