Push in joiner 8mm x 8mm

The top-hat or T-shaped grommet is a popular choice for use with an airlock in a fermenter lid. Tophat grommets are more robust than the black doughnut shape alternatives which can become damaged, however they are more easily popped out if there is excessive pressure build up in your fermentation vessel due to a blocked airlock.

Demijohn Bored Bung 28-30mm - with an airlock hole.

Fits perfectly a 5l (FLIP TOP ONLY) glass demijohn for a tight seal. 
Not compatible with the wide mouth screw top demijohns.

Typically made from rubber or silicon.

Rubber stopper / bored bung #10 with airlock hole.

Fits our 11.5l & 23l plastic foodgrade PET carboys perfectly.
#10 size is a standard bung size, in this case 41mm diameter across on the small side, going to 51mm on the wider side.

A "doughnut" shaped black grommet for the standard airlock hole in plastic fermenters. Compatible with both Senior and Vintage airlock type. Has a centre groove which allows it to clip into the fermenter lid, making it more resistant to being pushed out if pressure builds up during fermentation.

A Female adaptor 5/16 x 5/8 BSP.

A 5/16" x 3/8" John Guest straight connector to connect a 3/8" tube to a 5/16" tube.

Commercial grade Equal Straight Connector, ideal for joining two 5/16" tubes together.