air hole
armhole
blowhole
bullet-hole
bunghole
cringle
deadeye
eye
eyelet
gland
grommet
guide
keyhole
knothole
loop
loophole
manhole
mousehole
packing
padding
peephole
pigeonhole
pinhole
placket
placket hole
porthole
punch-hole
spiracle
stopping
stuffing
tampon
tap
vent
venthole
wadding
casket
seal
O-ring
harbor gaskets
head gasket
sea gaskets
gaskets
ammeter
clamp
diaphragm
elastomer
fitting
flange
gage
hose
piston
spacer
swimsuit
tubing
under-garment
washer
basket
mascot