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Metric PVC Plain Socket Tank Connector/Bulkhead

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Bulkhead/Tank Connector Fittings (7mins) - Summary available at bottom of page

Fitting threaded fittings to tank connectors / bulkheads.

20/25mm x 3/4

20/25mm x 3/4" Socket/Spigot PVC Tank Connector

Part Number: 16678-P

Has a 20mm socket on both sides and a single 25mm spigot on the plain side. PN10 WP. A 27mm Holesaw is recommended for threaded end. A small bead of silicone should be used externally. WRAS approved (suitable for potable water)

Currently in stock at our UK warehouse

£8.92 (£10.70 inc VAT)

25/32mm x1

25/32mm x1" Socket/Spigot PVC Tank Connector

Part Number: 16679-P

Has a 25mm socket on both sides and a single 32mm spigot on the plain side. PN10 WP. A 35mm Holesaw is recommended for threaded end. A small bead of silicone should be used externally. WRAS approved (suitable for potable water)

Currently in stock at our UK warehouse

£11.22 (£13.46 inc VAT)

32/40mm x1-1/4

32/40mm x1-1/4" Socket/Spigot PVC Tank Connector

Part Number: 16680-P

Has a 32mm socket on both sides and a single 40mm spigot on the plain side. PN10 WP. A 43mm Holesaw is recommended for threaded end. A small bead of silicone should be used externally. WRAS approved (suitable for potable water)

Currently in stock at our UK warehouse

£21.01 (£25.21 inc VAT)

40/50mm x1-3/4

40/50mm x1-3/4" Socket/Spigot PVC Tank Connector

Part Number: 16681-P

Has a 40mm socket on both sides and a single 50mm spigot on the plain side. PN10 WP. A 54mm Holesaw is recommended for threaded end. A small bead of silicone should be used externally. WRAS approved (suitable for potable water)

Currently in stock at our UK warehouse

£24.46 (£29.35 inc VAT)

50/63mm x2

50/63mm x2" Socket/Spigot PVC Tank Connector

Part Number: 16682-P

Has a 50mm socket on both sides and a single 63mm spigot on the plain side. PN10 WP. A 60mm Holesaw is recommended for threaded end. A small bead of silicone should be used externally. WRAS approved (suitable for potable water)

Currently in stock at our UK warehouse

£26.75 (£32.10 inc VAT)

63/75mm x 2 1/2

63/75mm x 2 1/2" Socket/Spigot PVC Tank Connector

Part Number: 16683-P

Has a 63mm socket on both sides and a single 75mm spigot on the plain side. PN10 WP. A 76mm Holesaw is recommended for threaded end. A small bead of silicone should be used externally. WRAS approved (suitable for potable water)

Currently in stock at our UK warehouse

£48.55 (£58.26 inc VAT)

75/90mm x3

75/90mm x3" Socket/Spigot PVC Tank Connector

Part Number: 16684-P

Has a 75mm socket on both sides and a single 90mm spigot on the plain side. PN10 WP. A 92mm Holesaw is recommended for threaded end. A small bead of silicone should be used externally. WRAS approved (suitable for potable water)

Currently in stock at our UK warehouse

£38.30 (£45.96 inc VAT)

90/110mm x M113 Socket/Spigot PVC Tank Connector

90/110mm x M113 Socket/Spigot PVC Tank Connector

Part Number: 16685-P

Has a 90mm socket on both sides and a single 110mm spigot on the plain side. PN10 WP. A 114mm Holesaw is recommended for threaded end. A small bead of silicone should be used externally. WRAS approved (suitable for potable water)

Currently in stock at our UK warehouse

£156.59 (£187.91 inc VAT)

110/125mm x M133 Socket/Spigot PVC Tank Connector

110/125mm x M133 Socket/Spigot PVC Tank Connector

Part Number: 16686-P

Has a 110mm socket on both sides and a single 125mm spigot on the plain side. PN10 WP. A 133mm Holesaw is recommended for threaded end. A small bead of silicone should be used externally. WRAS approved (suitable for potable water)

Currently in stock at our UK warehouse

£190.40 (£228.48 inc VAT)

Bulkhead/tank connector fittings are designed to go through the side of a tank either as a drain, a supply, or an overflow. They are inserted through a hole in the tank wall and clamp onto that wall so the fluid can flow through without leakage. There are three different types of bulkhead fittings: an imperial bulkhead fitting, a threaded imperial bulkhead fitting, and a metric bulkhead fitting. This page features the metric bulkhead fitting, which is plain to threaded.

Read More

The metric bulkhead fitting has a nut that is a part of the fitting itself, so one side of the bulkhead fitting is a solid piece of plastic. To go onto this side, there are two EPDM seals and a second, separate, nut. One of the EPDM seals goes down to the inside of the nut attached to the fitting and this presses against the wall of the tank, then the other EPDM seal goes onto the other side of the fitting against the other side of the tank, and the separate nut threads down to press against that. This fitting provides a very good seal as there is no way that the fluid will go down the thread and under the nut because the nut is a part of the fitting itself. The only way a leak might happen is if the tank is a rough GRP tank, in which case a bead of silicon around the exposed side of the EPDM seal which will press against the tank wall will seal up any roughness and prevent a leakage.

An advantage of the metric bulkhead fitting is that it is a moulded fitting. This means that it's a 50mm socket on one inside and a 63mm spigot on the outside, and a 50mm socket on the other inside. The size of the sockets on the inside is the same and so rather than having to find something to put on the thread, you can glue a piece of pipe inside the fitting if you want and put an elbow on, for example. The metric bulkhead fittings are therefore more versatile than the imperial ones.

It is important to note that these fittings have a parallel thread rather than a taper thread. If you want to thread another fitting on the other side of the bulkhead fitting, remember that most PVC fittings have a taper thread, and so your other fitting will only go on about three or four threads, rather than all the way down - so don't be surprised if that happens.

Deciding which bulkhead fitting you need depends on your application. Are you metric or imperial? How neat do you want the bulkhead on the side of your tank? Do you want to be able to glue pipe on the inside and the outside?

We would always recommend using a hole saw to cut the hole in the tank, rather than trying with a jig saw or anything else. Our bulkhead pages provide links to the correct size of hole saw needed for the relevant bulkhead fittings.

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