Fluidmaster PRO45B Bottom Entry Fill Valve 1/2″ Brass Shank

The Fluidmaster PRO45B is a bottom entry fill valve with a 1/2″ BSP brass shank. Fluidmaster give the height range as 230mm to 355mm (9″ to 14″), so this Fluidmaster fill valve suits most close coupled and low level cisterns. It is for plumbers and householders sorting a cistern that hisses, runs on or fills slowly.

It fits up through the hole in the base of the cistern, with the supply coming from below. The brass shank means the thread is hard to damage when you tighten the backnut. Fluidmaster rate it for 0.2 bar to 15.85 bar, so it works on both low and high pressure supplies. The float rides up the body, so there is no float arm to catch on the flush valve. Fit a service valve on the feed so you can work on it later.

We stock genuine Fluidmaster valves. Collect from our Glasgow shop or order online.

Specification

• Brand: Fluidmaster
• Maker code: PRO45B
• Material: ABS, brass, POM, rubber and stainless steel
• Connection: 1/2″ BSP brass shank, bottom entry
• Sizes: 1/2″; height 230mm to 355mm
• Standard/approval: BS 1212-4:2016, when a suitable backflow prevention device is fitted
• Max pressure: 15.85 bar (works from 0.2 bar)
• Suitable for: WC cisterns, high and low pressure supplies

Common Questions

Which Fluidmaster fill valve do I need?

Look at where the water pipe goes into the cistern. If it comes up through the base, you need a bottom entry valve like the PRO45B. If it goes in through the side near the top, you need a side entry valve.

How do I adjust the water level?

There is an adjuster on the float. Move it a little at a time and let the cistern refill until the water stops below the overflow.

How does a Fluidmaster fill valve work?

As the cistern fills, the float rises with the water. When it reaches the set level it closes the valve, and when you flush it drops and lets water back in.

Brass shank or plastic shank?

A brass shank gives a stronger thread that is harder to damage when you tighten the backnut. A plastic shank is fine on most domestic cisterns.

Collect from our Glasgow shop at 555 South Street, Glasgow G14 0QX, open Mon-Fri 8am-5pm and Sat-Sun 8am-1pm, or order online for delivery.