How it connects
A flexible vinyl or rubber refill tube is pushed directly into the smooth bore of the plastic socket, held in place and sealed against low backpressure entirely by friction and elastic interference fit without clamps or latches.
Male and female halves
Female socket port integrated into the fill valve body or cap; receives the male outer diameter of a flexible refill hose.
Usually connects to
- Flexible vinyl or rubber toilet refill tube
Common sizes
- Typically accepts standard 1/4" ID to 3/8" OD (around 8 mm to 9.5 mm OD) flexible toilet refill tubing with an insertion depth around 10 mm.
Where it is used
residential plumbingcommercial plumbinggravity-flush toilet tanks
Variations
- Push-in female socket port
- Male hose barb refill nipple
How to recognise it
A smooth, unthreaded, unlatched circular bore or cavity molded into the upper plastic cap or side body of a toilet fill valve (ballcock).
Often confused with
| Confused with | How to tell them apart |
|---|---|
| Push-to-connect (collet / John Guest style) tube fitting | Push-to-connect fittings feature internal metal grab rings/collets and O-rings, whereas this socket is a plain unlatched plastic bore relying purely on friction. |
| Male barbed hose refill port | Male barbed ports require the tube to stretch over the outside of an external projecting stem with ridges, whereas this female socket accepts the tube pushed into its internal cavity. |
Also called
toilet fill valve refill tube portrefill hose portrefill tube nipple female socket
Good to know
Commonly found on modern compact adjustable toilet fill valves (such as QuietFill / anti-siphon valve models) where the refill hose pushes into the valve head rather than over a barbed spout.
Related connections
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