420, 420XL420, 420XL ¾”-1” ¾”-1”

Modification OverviewModification Overview

Production for the 420 began in 1998.Production for the 420 began in 1998. The first version of the 420 had male threads on The first version of the 420 had male threads on

the body and female threads on the bonnet. This the body and female threads on the bonnet. This version was discontinued shortly after version was discontinued shortly after production started.production started.

The current 420 has female threads on the body The current 420 has female threads on the body and male threads on the bonnet.and male threads on the bonnet.

A lead free version (420XL) was introduced in A lead free version (420XL) was introduced in 2010.2010.

Canopy RemovalCanopy Removal

The canopy is The canopy is secured by one secured by one screw.screw.

Bonnet RemovalBonnet Removal

The bonnet is The bonnet is threaded into the threaded into the body and sealed by body and sealed by an o-ring.an o-ring.

Unscrew the bonnet Unscrew the bonnet counter clockwise.counter clockwise.

* Note: Apply force at * Note: Apply force at the outside edge.the outside edge.

There is no spring There is no spring loadload

Float Removal and ServiceFloat Removal and Service The float is free once The float is free once

the bonnet has been the bonnet has been removed.removed.

* Note: The float * Note: The float contains a relief valve contains a relief valve to protect against to protect against freeze damage. If the freeze damage. If the RV is damaged, the RV is damaged, the float must be float must be replaced.replaced.

Replace the rubber Replace the rubber seal by pulling it from seal by pulling it from the groove on the the groove on the float.float.

Check Valve RemovalCheck Valve Removal

Check valve module.Check valve module. The module is sealed The module is sealed

by an o-ring.by an o-ring. Slide the module out Slide the module out

of the body.of the body.

Check Valve DisassemblyCheck Valve Disassembly

Module is spring Module is spring loaded.loaded.

Remove spring Remove spring retainer by pressing retainer by pressing down and rotating to down and rotating to clear the tabs on seat.clear the tabs on seat.

Check Disc ReplacementCheck Disc Replacement

Replace the rubber Replace the rubber disc by pulling it from disc by pulling it from the groove on the the groove on the poppet.poppet.

Check Seat ReplacementCheck Seat Replacement

The seat is free once The seat is free once the check is the check is disassembled.disassembled.

Reassembly NotesReassembly Notes

Reassemble in Reassemble in reverse order.reverse order.

Make sure the check Make sure the check module slides into the module slides into the seat guides located in seat guides located in the body.the body.

Lubricate the check Lubricate the check and bonnet o-rings.and bonnet o-rings.