---
product_id: 45620976
title: "4\" Extend & Lok™ for Effluent Filters"
brand: "polylok"
price: "S$131"
currency: SGD
in_stock: true
reviews_count: 8
url: https://www.desertcart.sg/products/45620976-4-extend-and-lok-for-effluent-filters
store_origin: SG
region: Singapore
---

# Fits 4" Pipes No Gluing Required Easy Installation 4" Extend & Lok™ for Effluent Filters

**Brand:** polylok
**Price:** S$131
**Availability:** ✅ In Stock

## Summary

> 🔗 Lock in Quality with Ease!

## Quick Answers

- **What is this?** 4" Extend & Lok™ for Effluent Filters by polylok
- **How much does it cost?** S$131 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/45620976-4-extend-and-lok-for-effluent-filters)

## Best For

- polylok enthusiasts

## Why This Product

- Trusted polylok brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Durable Design:** Built to last, ensuring long-term performance and reliability.
- • **Hassle-Free Setup:** Say goodbye to messy gluing—install in minutes with no fuss!
- • **Versatile Options:** Available for 3" and 6" pipes, catering to all your filtration needs.
- • **Efficient Filtration:** Enhances your effluent system, promoting optimal water quality.
- • **Seamless Compatibility:** Easily fits any 4" pipe, ensuring a perfect match every time.

## Overview

The Polylok 4" Extend & Lok™ for Effluent Filters is a versatile and user-friendly solution designed to fit any 4" pipe. With no gluing required, installation is quick and straightforward, making it an ideal choice for both professionals and DIY enthusiasts. Available in multiple sizes, this durable filter extension ensures efficient filtration and long-lasting performance.

## Description

Full description not available

## Features

- Fits any pipe with an inside diameter of 4"
- Centers filter or tee under riser
- Easy Installation
- No gluing necessary
- Also available for 3" pipe and 6" pipe

## Images

![4" Extend & Lok™ for Effluent Filters - Image 1](https://m.media-amazon.com/images/I/41jI6HwMfgL.jpg)

## Questions & Answers

**Q: Manufacturer says this can be used to extend an inlet pipe. Using this on an inlet pipe to a tank may create clogs. has any had problems?**
A: Discharging my rv into the septic inlet using this piece connected to pvc.  No clogs so far.

**Q: Do you have the 6 inch extend & lok ?**
A: Yes, https://www.amazon.com/PolyLok-Extend-Lok-Effluent-Filters/dp/B085T216N7/ref=sr_1_2?crid=1C80QAOEMN52E&keywords=Polylok+6%22+Extend+%26+Lok%E2%84%A2+for+Effluent+Filters&qid=1640266938&sprefix=polylok+6+extend+%26+lok+for+effluent+filters%2Caps%2C81&sr=8-2

**Q: What is the outter diameter of the small end (that gets twisted into the existing). It should be smaller than 4 inches so it can eventually snug up.**
A: It is less than 4 inch as it did slip into the 4 inch pipe.  But I've already installed so can't measure.

**Q: Will this work on inlet clay pipe**
A: "Fits any pipe with an inside diameter of 4"
https://www.youtube.com/watch?v=iFqMv1P4h_E&feature=emb_imp_woyt
Fits: Clay, Cast Iron, SCH 40 PVC / ABS, and SDR 35 PVC pipe.

## Customer Reviews

### ⭐⭐⭐⭐⭐ solved my problem
*by A***R on June 19, 2025*

Fit as expected, strong and easy to install

### ⭐⭐⭐⭐⭐ Just as stated would recommend.
*by D***R on June 2, 2025*

Worked good.

### ⭐⭐⭐⭐⭐ Awesome , well built and designed. Works 100% as designed.
*by J***S on May 1, 2025*

These are awesome. Saved my butt big time when the output Terra cotta busted right off. Let the tank dry out for a day, jumped in and used a 2x4 do gently seat it, but my sanitary tee on and hasn’t moved a bit. Life saver.

## Frequently Bought Together

- Polylok 4" Extend & Lok™ for Effluent Filters
- Polylok PL-68 Effluent Filter & Housing (Baffle/Tee)
- Tuf-Tite Effluent Filter EF-4 Combo

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**Shop now:** [https://www.desertcart.sg/products/45620976-4-extend-and-lok-for-effluent-filters](https://www.desertcart.sg/products/45620976-4-extend-and-lok-for-effluent-filters)

---

*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-02-20*